RSBG Plant distribution catalog(RSF) Availible, Glossary, Ordering
Short description of most species. updated from RSF catalogs by Jerry L. Fickes updated by Hans Eiberg 1997
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Aaberconwayi Irrorata Shrubs, 5 to 8 ft. Flowers (May) are white to pale rose with crimson spots. Unusual, stiff upward-curving leaves. Limited distribution in the wild. Found on mountain summits from 6,000 to 8,000 ft. China 64/015 ('His Lordship') WGP-ACL (+5). An award form with flowers white spotted red. AM 1945 73/001 EXB: FR: PHB (+5). 78/015 'Westhaven' MCG (+5). Flowers white with maroon spots. adenogynum Taliensia Shrubs or small trees, 2 to 13 ft. Flowers (April-May) are white or pale pink, sometimes with purple flecks. Dark green leaves with dense woolly indumentum, yellow-colored at first then maturing to a warm olive-brown. Usually semi-dwarf and slow growing. Found in open pastures, rhododendron or bamboo thickets, conifer forests, and on cliffs from 10,000 to 14,000 ft. China 75/248 (adenophorum) FD-WEB (-5). Flowers rose shaded white, in April. 79/104 (adenophorum 'Kirsty') Rock 11471: BH (-5). An award form with white suffused reddish-purple flowers. AM 1976 82/141 BRP (-5) adenopodum Argyrophylla Shrubs up to 10 ft. Flowers (April-May) are pale rose sometimes spotted. Slow growing. Long dark green leaves with gray to fawn indumentum below. Native to open woods at 5,000 to 7,200 ft. China 73/003 FR - PHB (-5). Pale rose form. 76/142 WGP (-5). An award form with rose-pink spotted crimson flowers, and grey tone indumentum. AM 1926 adenosum Glischra Shrubs from 6 to 15 ft. Flowers (April-May) are pale pink with purple flecks. Leaves and branches with characteristic bristles and viscid glands. Limited distribution in the Muli region of Sichuan Province. Found in spruce forests and near swamps at 10,000 to 1,500 ft. China 75/325 (kuluense) ACB (0) 76/211 (kuluense) RBG (0) 76/187 RBGE (0). Flowers pale pink becoming darker at the tips with a magenta blotch and flecks. afghanicum Afghanicum Dwarf shrubs to 18". Flowers (June) are greenish-white to white. Very rare in cultivation. Grows on limestone cliffs in forests at 7,000 to 9,000 ft. Afghanistan, Pakistan 80/083 Wendelbo 9706: RBG (+10). A form with white to green-white flowers. aganniphum var. aganniphum Taliensia Shrubs to 10 ft. though generally smaller. Flowers (April-May) are white to flushed pink, with purple flecks. The compacted to spongy indumentum of this variety remains largely intact upon maturity and is a deep red-brown. Abundant among rocks in moorland and damp meadows, open conifer forests, and bamboo thickets at 11,000 to 15,000 ft. China 77/771 (gaucopeplum) F 25520: WGP (-5) aganniphum var. flavorufum Taliensia Generally small shrubs with some forms reaching 10 ft. Flowers (April-May) are white or white flushed with pink. Distinctive indumentum splits into small irregular patches and is buff to red-brown when mature. Abundant in the wild and merges completely with var. Aganniphum and found on the margins of forest, among boulders and scrub on slopes, and on cliffs from 11,000 to 15,000 ft. China 70/407 (flavorufum) F 14368: RBG (-5) White flowers in April albertsenianum Neriiflora Shrubs, 3 to 6 ft. Flowers (April) are bright crimson rose. Leaves with bistrate indumentum, an unusual feature for a species in this subsection, brown in color, the upper layer loose and woolly, and the lower felted and compact. Collected only once in the wild and still rare in cultivation. Found in open forests at 10,000 ft. China 75/093 F 14195: WGP (+5). Collected by George Forrest on the divide between the Mekong and Salween Rivers during his 1912-14 expedition to upper Yunnan Province. A form with red flowers. alutaceum var. alutaceum Taliensia Usually dwarf shrubs to 2 ft. with some forms to 15 ft. Flowers (March-April) are white to pink to lilac-mauve, sometimes spotted. Narrow leaves with attractive indumentum. Found in open pastures and thickets from 9,000 to 14,000 ft. China 76/202 RBG (-5). A form with vibrant rose-pink flowers. 77/656 (syn. globigerum) F. 25738 WGP (0). White flowers with maroon spots. alutaceum var. iodes Taliensia Shrubs, 5 to 12 ft. Flowers (April-May) are white to flushed rose sometimes with a crimson blotch. Leaves with a pale fawn indumentum below. Found in conifer forests, thickets, and on slopes among rocks at 10,000 to 14,000 ft. China 75/199 (iodes) R 19: CS (-5). White flowers with red spotting. 75/321 (iodes) BENM:UBC ((5). Flowers white. 79/111 (iodes 'White Plains') BH (-5). An award form with white flowers spotted red-purple. AM 1978 amagianum Brachycalyx (Azalea) Dainty deciduous shrubs to 15 ft. Flowers (June) are bright pink-orange, red-orange, to brick red with brown spots. Rare in the wild and slow to bloom in cultivation. Late flowering and difficult to propagate. Yellow-orange leaf color in autumn. Found only at lower elevations in southern Japan. 73/356 PH Brydon (0). Brick red flowers. ambiguum Triflora Shrubs, 3 to 18 ft. Flowers (April-May) are yellow, often with greenish spots on the upper lobe. The hardiest of the large yellow-flowering species in this subsection. Found in western Sichuan near Mt. Omei and Kangding (Tatsienlu). Native to thickets on wooded hillsides and rocky exposed slopes at 8,500 to 14,500 ft. China 80/108 ('Jane Banks') HER (-5). An award form with yellow flowers. AM 1976 82/156 Copenhagen BG-JC Birck (-5). Hardy form. 82/182 (chengshienianum) KR 139: TJ (-5). Form collected from famous Mt. Omei. Yellow flowers. amesiae Triflora Shrubs, 7 to 13 ft. Flowers (May) are purple to dark reddish-purple. Closely related to R. concinnum. but more rare in cultivation. Found in the northwestern Sichuan near Mupin. Grows in woodland and thickets from 7,500 to 10,000 ft. China 80/071 CH (0) 81/015 Univ. Newcastle-Upon-Tyne (0) 82/092 RBG: GBG (0) Form with reddish-purple flowers. annae Irrorata Shrubs, 8 to 15 ft. Flowers (April) are white, suffused rose, without spots or spotted purple to pink. Corolla cup shaped to openly campanulate. Found in and on margins of mixed thickets and forests from 4,500 to 11,000 ft. China (Yunnan, Guangxi), NE Burma 69/072 (laxiflorum) EXB - MVW (+5). Flowers pure white. 70/132 (hardingii) STR (+5). Medium shrub with narrow leaves and white flowers. anthopogon ssp. anthopogon Pogonanthum Well-branched shrubs to 3 ft. with one-inch aromatic leaves. Delicate paper thin flowers (April-May) are creamy-yellow to white to pink. Native to open slopes and hillsides at 11,000 to 16,000 ft. Nepal, India, Bhutan, China 68/588 ('Betty Graham') L&S 1091: GLE (0). A compact low shrub with aromatic leaves and deep pink flowers. An award form. AM 1969 80/152 LF - UBCP(0). A form with white flowers. 82/171 Hedegaard 397 (0). A form with creamy yellow white flowers. anthopogon ssp. hypenanthum Pogonanthum Dwarf shrubs, 1 to 3 ft. Flowers (April-May) are white to deep pink, rarely creamy yellow. A geographical variant of ssp. anthopogon which is easier to propagate. Found commonly on open slopes and ledges from 11,000 to 16,000 ft. India, Nepal, Bhutan 79/051 (hypenanthum 'Annapurna') GLE (0). Form with primrose yellow flowers. anthosphaerum Irrorata Shrubs or small trees, 3 to 30 ft. Tubular-campanulate flowers (March-May) are pale pink to deep magenta, or crimson, often with crimson flecks, and with or without a crimson basal blotch. Variable in form and flower. Found in deciduous woodlands and on rocky slopes from 9,000 to 13,000 ft. China, Burma 64/116 LEO (+10). Early blooming form with rose marked lavender flowers. 77/736 (syn. eritimum ) R 11354: WGP (+10). Flowers are pink blotched red. araiophyllum Irrorata Shrubs or small trees to 20 ft. Flowers (April) are white flushed rose with a crimson blotch and spots. Found in rainy subtropical mixed forests at 7,500 to 11,000 ft. China, Burma 80/041 Forrest 27698 (+20): BH arborescens Pentanthera (Azalea) Deciduous shrubs to 20 ft. Flowers (July) are white or white flushed pink, often with a yellow blotch, and strong heliotrope-like fragrance. Grows near streams and on wooded mountain tops at elevations up to 5,500 ft.Commonly called the Sweet Azalea and found from Kentucky to central Alabama and Georgia northwards to New York. E USA. 76/273 HTS 1100A: NA 13217-USNA (-10). White flowers 80/012 CT (-10). White flowers with a yellow blotch. Collected in South Carolina. 81/074 BIL (-10). Form with light pink flowers. arboreum ssp. arboreum Arborea Large trees, often growing to 100 ft. in the wild, hence its name, meaning tree like. Rarely under 6 ft. on exposed sites. Flowers (May) are bright red to carmine, rarely pink or white. Leaves dark green, narrowly to broadly elliptic or ovate with white to silver-colored indumentum below. Perhaps the most widespread, common and variable species in the world found from 6,000 to 9,000 ft. Native to the foothills of the Himalayas in India ( Kashmir, Punjab, Himachal Pradesh, Uttar Pradesh, Sikkim, West Bengal),N India, Nepal, Bhutan. 64/118 Leonardslee (0). Clear pink flowers in faultless trusses. 76/002 (arboreum) JHC (0). A form with crimson flowers. 79/010 (arboreum 'Dr. Bowman') KW 21976: PS (+10). A form with brilliant red flowers. 80/127 Trewithen (+10) arboreum ssp. cinnamomeum var. cinnamomeum Arborea Trees, 40 to 60 ft. Flowers (April) are pink to carmine, rarely white. Leaves with dark rusty-brown indumentum. Found in open forests and on rocky slopes from 8,000 to 12,000 ft. Nepal, India. 80/103 (arboreum ssp. campbelliae) KLT (+15) 84/074 (arboreum) LOG (0). A form with delicate clear pink flowers. arboreum ssp. cinnamomeum var. roseum Arborea Trees or large shrubs to 40 ft. or more. Flowers (April-May) are pink to carmine, rarely white. Leaves with a matted indumentum, fawn or white in color. A relatively hardy variety with many forms. Found in open forests or on rocky slopes from 8,000 to 12,000 ft. N Nepal, India (N West Bengal, Sikkim, E Arunachal Pradesh), China (Tibet), Bhutan. 71/406 (arboreum var. album) LOC: UBCP (0). White flowered form. 76/372 (arboreum var. album) TRW: WEB (0). White flowered form. 76/159 BOD (0). Trusses of rose-pink flowers. arboreum ssp. delavayi var. delavayi Arborea Large shrubs or trees to 30 ft. Flowers (March-April) are usually deep crimson to carmine. A less variable and less hardy subspecies. Found in open forests among scrub and thickets from 5,000 to 10,000 ft. NE India, Burma, Thailand, China 73/345 (delavayi) (+15) 77/800 (delavayi) Crarae (+15) arboreum ssp. zeylanicum Arborea Slow-growing small trees to 30 ft. Late season flowers (June- July) are red to crimson-rose or carmine. With bullate leaves and fawn to tawny indumentum, spongy to the touch. A geographically isolated subspecies in the southern most extension of R. arboreum. Found in mountainous regions from 3,000 to 8,000 ft. Sri Lanka 76/225 (zeylanicum) BRO: WEB (+15). Red Flowers argyrophyllum ssp. argyrophyllum Argyrophylla Shrubs or small trees, 6 to 25 ft. Campanulate flowers (April- May) can be white through pink to rose, often with purple flecks. A hardy species with very wide flowers. Leaves with dense indumentum in white, through silver of fawn. Found on open slopes as well as forests and thickets from 6,500 to 11,500 ft. China. 76/003 JHC (0). Deep pink flowers with darker flecks on upper lobe. 77/654 (argyrophyllum var. cupulare) Wilson 4275: WGP (0). A form with silvery-white felted indumentum and late season cup-shaped light pink flowers. argyrophyllum ssp. hypoglaucum Argyrophyllum Shrubs to 20 ft. Flowers (May) are white to pale pink with deep rose spots. Small but fine flowers on attractive plants. Common among thickets and woodlands from 5,000 to 9,000 ft. China 75/067 (hypoglaucum) Wakehurst (0). White flowers. 80/119 (hypoglaucum) Reuthe-Hergest Croft (0). argyrophyllum ssp. nankingense Argyrophylla Shrubs, 10 to 16 ft. Flowers (May) are pink or lilac-purple with crimson spots. Attractive glossy deep green leaves. Larger leaves and flowers than related subspecies. Found on rocky slopes to 7,500 ft. China 64/014 ('Chinese Silver') WGP (-5). An award form with delicate pink flowers. AM 1957 73/008 SUN: CHP (-5). Deep pink flowers with crimson spots. agryrophyllum ssp. omeiense Argyrophylla Shrubs, 10 to 16 ft. Flowers (May) are white with deep rose spots. Leaves with fawn indumentum. A rare geographical variant found only on Mt. Omei in Sichuan Province growing in forested ravines and on rocky slopes at 6,000 ft. China 79/155 Hu 8189: UW 808-47-UWA (0) atlanticum Pentanthera (Azalea) Deciduous stoloniferous shrubs to 5 ft., though generally less. Flowers (May-June) are white, or white flushed pink or purple and fragrant. Forms thick colonies with underground horizontal stems in its native habitat from Georgia to southeastern Pennsylvania. Leaves often glaucous blue turning orange in autumn. Found in sandy forests in coastal areas. E USA 73/010 HTS 10024-S: USNA (-10) Collected in Kent County, Delaware. Fragrant white flowers. 74/133 PH (-10) 76/275 HTS 550: USNA (-10). Propagated from a plant collected in Beaufort County, South Carolina. Flowers white flushed pink and scented. 81/075 Biltmore (-10) Fragrant, tall form. augustinii ssp. augustinii Triflora Shrubs, 3 to 30 ft. Flowers (April-May) are pale blue to lavender to violet or white with green, yellow-green, brown, or ocher spots. Characteristic fine hairs on the undersurface of the leaves give the effect of thin velvet to the touch. This subspecies is native in the provinces of Hubei and eastern Sichuan. Found on rocky slopes and forest margins from 4,500 to 10,000 ft. China. 63/005 WGP: MVW (+5). Large lavender-blue flowers with golden-green flecks. 64/206 'Electra' BRA: MVW (0). An award of Merit form, 1940 75/131 GAB (-5). Form with grey-lavender flowers and gold spotted nectar guides. 75/278 (vilmorinianum) WGP: UBC (-5). White faintly tinted pink flowers with gold spots. Described from cultivated plants by Bayley Balfour and other and is possibly a garden hybrid between R. augustinii and R. yunnanense. Included for historical interest. 75/309 'Barto Blue' CHP (-5). Pale lavender flowers with purple stamens and style. American selection, equals the imports in blueness, with added hardiness. 77/207 GVW (0) 77/286 (Whalley Form) LP (0). Flowers are green eyed near to blue in this selection. 77/789 JHC (0). Deep violet-purple flowers, one of the most frequently praised plants in the study garden. 80/043 BH (0). A form with pale blue-lavender flowers. augustinii ssp. chasmanthum Triflora Shrubs to 25 ft. Flowers (May) are violet-blue, mauve or white. A later flowering subspecies. Found on forest margins and in scrub at 7,000 to 12,000 ft. China 69/092 SUN (0). Of particular garden value for its late lavender flowers marked yellow to white. An award form. FCC 1932 augustinii ssp. hardyi Triflora Shrubs (deciduous or semi-deciduous), 4 to 10 ft. Flowers (May) are white or greenish-white with yellow-green spots. A handsome shrub with attractive bronze colored new foliage. Found in thickets and forests 11,000 to 12,000 ft. China 78/065 (hardyi) Cox-WEB (0). White flowers with a yellow center. aureum var. aureum Pontica Dwarf shrubs from 6 inches to 3 ft. Flowers (March-April) are yellow usually with flecks. Plant habit mounded or prostrate. Distributed over a wide area from central and eastern Siberia to the Kamchatka Peninsula, south through northern China, Korea, and on the islands of Hokkaido and central Honshu. The most northerly of all elepidote species. Forms huge mats in large areas of its native habitat on windswept alpine slopes from 5,000 to 9,000 ft. USSR, China, Korea, Japan 64/208 (chrysanthum) GRE: MVW (-10) 76/109 ( chrysanthum) WEB (-10). A prostrate form with light yellow flowers from northern Japan. 76/194 RBG (-10). Collected in Siberia, form with yellow flowers. Auriculatum Auriculata Rounded shrubs or small trees to 25 ft. Distinguished for its late season flowers (July-August) that are white or creamy-white to rose and very fragrant. Distinctive leaves, oblong to oblong- oblanceolate, with the base auriculate, or 'eared'. Tolerant of most east coast climates. Common in the provinces of eastern Sichuan, western Hubei, and northeastern Guizhou. Native in dense woods to rocky slopes at 1,600 to 7,500 ft. China 67/698 BOD (-5). An award form with pure white, fragrant flowers in July. AM 1922 81/025 GRE: UBCP (-5). Pink flowers. aurigeranum Vireya Tree like growth up to 8 ft. Flowers (variable) are deep pure yellow or pale orange. Can have up to 17 flowers per truss on mature plants. Native to New Guinea from 3,000 to 5,700. 78/104 H. Winters-FM (+32). Deep pure yellow flowers, up to 17 per truss. auritum Tephropepla Upright shrubs to 10 ft. Flowers (April) are pale yellow or cream. Rare in the wild and somewhat tender due to the low elevations of collected material. Found only on sheltered cliffs at 7,000 to 8,500 ft. China 65/269 Lochinch (+10). Shining reddish brown stems harmonize with gold-flecked leaves and straw yellow flowers. austrinum Pentanthera (Azalea) Upright deciduous shrubs to 12 ft. Flowers (May) are yellow to orange or reddish-orange and usually fragrant. Found in woods and on streambanks from northwest Florida and the Georgia-Alabama coastal plains to southeastern Mississippi at lower elevations SE USA 76/276 HTS 96: USNA (+5). Yellow flowers striped red outside. Collected wild in Walton County, Florida. 83/083 VAR (0). Buff-colored flowers. 83/084 VAR (0). Apricot colored flowers. 83/086 VAR (0). Peach colored flowers. 83/087 VAR (0). Flowers are an egg yellow. B bachii Azaleastrum Shrubs, 20 to 20 ft. Flowers (April) are pale to deep rose or lavender. Found in thickets, scrub, and on forest margins in a subtropical habitat from 4,000 to 11,000 ft. China 79/157 UCB (+15). Form with light lavender flowers. baileyi Baileya Shrubs, 1 to 6 ft. Usually striking flowers (April) are magenta to purple, often spotted. Native to moist rocks and dry scree of hillsides at 10,000 to 14,000 ft. India, Bhutan, China 64/146 L&S 2869: GLN (+5). Form with intense purple flowers. 75/035 K&P (+5). Dense growth habit with intense purple flat faced flowers. bainbridgeanum Selensia Shrubs, 3 to 6 ft. Campanulate flowers (April) are white, creamy-white flushed pink or rose, creamy yellow, or pink to red-pink, often spotted with purple and with or without a broad blotch. Obovate to elliptic-shaped leaves with a tawny to brown-colored indumentum on the undersurface. Many different forms have been collected in the wild where it ranges among boulders, on cliffs, in open thickets of scrub and on the edges of coniferous woodlands from 10,000 to 13,000 ft. China, NE Upper Burma 66/535 Forrest 21821: RBG (-5). Form with soft. pink flowers. 77/634 R 59184: WEB (+5)/ Creamy yellow flowers. bakeri Pentanthera (Azalea) Twiggy deciduous shrubs to 8 ft. Flowers (June-July) are orange to red. A valuable garden addition for its summer flowers. Native of the Cumberland Plateau in Kentucky to northern Georgia and Alabama. Found in open woodlands at higher elevations up to 4,100 ft. E USA 73/019 ('Camps Red') HTS: USNA (-15). Intense orange-red flowers. balfourianum Taliensia Shrubs, 3 to 15 ft. Flowers (March-May) are pale to deep pink, with purple flecks. A hardy, easily grown species that is fairly common in the wild. Found among thickets and rocky slopes from 10,000 to 15,000 ft. China 70/081 CHP (-5) 76/169 (balfourianum var. aganniphoides) CHP (-5). Pink in bud opening white. 76/251 Benmore (0). A medium sized shrub to 8 ft. barbatum Barbata Large shrubs or small trees, 5 to 20 ft. Flowers (February-March) are blood-red to crimson. Handsome peeling plum- colored bark and petioles with or without a dense covering of bristles. One of the most common species of the Himalayas and found in forests of birch, mountain ash, maple, and fir or amongst scrub from 8,000 to 12,000 ft. N India, China, Nepal, Bhutan 64/026 Windsor Great Park (0). 64/027 Windsor Great Park (0). Pure red trusses and larger lighter green leaves than usual. 70/018 WW (+10). Deeply impressed leaf veins create a bold foliage effect. 70/049 CS (0). A form with pure red flowers. beanianum Neriiflora Shrubs to 8 ft. Flowers (March-April) are carmine to blood-red. Excellent foliage with a woolly reddish-brown indumentum. Uncommon in the wild where it grows in bamboo forest and rocky gullies at 9,000 to 10,000 ft. NE Upper Burma, NE India 73/027 GRE - WW (+10). A form with blood-red flowers in April. 76/005 JHC (+10). Form with red flowers. 77/217 FR (+10). Distinctive carmine-colored flowers. 77/683 HOR: BRO (+10) beesianum Taliensia Shrubs or small trees, 6 to 30 ft. Flowers (April-May) are white flushed rose to pink, with or without crimson or purple spots and a basal blotch. Introduced from the wild several times but still rare in cultivation. Associated with conifers or socially isolated on precipitous slopes among rocks and boulders from 10,000 to 14,500 ft. China, Burma 78/044 CHP (0) blackii Euvireya Shrubs up to 16 ft. Leaves in pseudowhorls. Tubular flowers (flowering time varies) carmine, dark red, or flesh- colored. Native to Papua New Guinea from 8,200 to 11,100 ft. 88/044 KOR (+32). This clone from seed collected at 11,000 ft. in Papua New Guinea by the Aust. Rhod. Soc. Exp. 6-10", brachyanthum var. brachyanthum Glauca Shrubs to 6 ft. Flowers (June) are pale or greenish-yellow. Very aromatic leaves. Found on steep rocky hillsides usually in scrub or thickets at 10,000 to 11,000 ft. China 76/095 FR (+10) brachycarpum ssp. brachycarpum Pontica Shrubs, 8 to 12 ft. Flowers (May-June) are pink to white with brownish-green spots. A useful hardy late flowering species. Found on rocky slopes, often above the tree line from 6,000 to 8,000 ft. Japan, E Korea 75/132 GAB (-20). Form with yellow flowers. 79/056 WEB (-20) 82/184 ('Roseum') Tue Jorgensen 82/109 ("var. tigerstedtii") MUS ((45?). brachycarpum ssp. faurei Pontica Shrubs to 10 ft. Flowers (May-June) are pink to white with greenish flecks. Found among conifers on rocky slopes or above tree line at 5,500 to 7,500 ft. Japan, Korea 66/539 (faurei) RBG (-20). A reliably blooming form with light pink flowers. bracteatum Heliolipida Shrubs to 7 ft. Flowers (June-July) are white with many reddish spots. Found in woodlands and on cliffs at 11,000 ft. China 7/133 Wilson 4253: RBG (-5). Form with white flushed light rose flowers. breviperulatum Tsutsusi (Azalea) Semi-evergreen shrubs to 4 ft. Flowers (spring) are reddish and variable. Recently introduced into this country, found in mountain forests of Taiwan. 82/088 USDA 352582-Bovee Nursery (+32) brookeanum Euvireya (Vireya) Epiphytic or terrestrial shrubs, 6 to 15 ft. Funnel-shaped flowers (variable flowering time) are orange to orange-pink or red, with a white, cream or golden yellow center, and often fragrant. Found as an epiphyte on mangrove and mossy lowland trees, and on sandstone rocks from sea level to 4,600 ft. Malaysia (Sabah, Sarawak), Indonesia (W Sumatra, Boreno). 78/098 FM (+32). Orange-red flowers with yellow throat. bryophilum Phaeovireya Tropical shrubs to 6 ft. Tubular flowers (variable flowering time) are pink to pale salmon. Native to the Cycloop Mountains, New Guinea and epiphytic in forests from 3,500 to 6,000 ft. 80/141 BOS ((32). Propagated from a plant found in the Cycloop Mountains, New Guinea. Soft pink flowers. 6-10", bureavii Taliensia Shrubs, usually 3 to 10 ft. Flowers (April-May) are white flushed pink sometimes with purple flecks. Grown primarily for the outstanding warm wooly indumentum of leaf and twig. A superb foliage plant. Found in open pine forests and rhododendron thickest, 11,000 to 14,000 ft. China 75/081 Exbury (-10). An award of merit form, 1939. 75/138 BRA - FR (-10). Form with white flowers. 76/190 RBG (-10) Early flowers open light pink with purple spots from rose-colored buds. 83/036 BEN - TJ (-10). Form with white flowers. 84/147 H.L. Larson (-10) burmanicum Maddenia Shrubs to 6 ft. Flowers (April) are yellow to greenish-yellow, sometimes scented. A fine semi-dwarf for the mildest gardens. Limited distribution in the wild. Found along edges of forest on Mt. Victoria from 9,000 to 10,000 ft. 81/118 KW 21921 - JB - EK (+20). Form with yellow, fragrant flowers. 83/164 WGP (+20) burtii Euvireya (Vireya) Small shrubs to 2.5 ft. Flowers (variable flowering time) are bright red and are thought to be pollinated by small birds. Leaves, in pseudowhorls, are obovate in shape, with the margins slightly recurved, and the main vein impressed. Epiphytic in sub-mountain tropical forests from 5,000 to 5,300 feet. Found in the states of Sabah and Sarawak, Malaysia, on the island of Boreno. 87/039 GA 821527: RBG (+32). Flowers vermillion in color. C caesium Trichoclada Semi-evergreen shrubs to 6 ft. Flowers (May) are greenish to pale yellow with green spots. Attractive blue-green leaves and pale shiny brown bark. Found on rocky slopes from 8,000 to 10,000 ft. China 76/134 Forrest 26798: RBG (0). With aromatic leaves and greenish-yellow flowers. calendulaceum Pentanthera (Azalea) Upright deciduous shrubs to 12 ft. Flowers (May-June) are orange to red, rarely, yellow. Quite hardy but variable in flower color and appearance from year to year and in different climates. Found in open woods and on hillsides at 1,800 to 5,000 ft. E USA 77/650 GRI (-20) Large orange-flowered selection collected near Barto, West Virginia 81/076 BIL (-20). A polyploid orange form. 82/077 'Burning Light' WGB: UBC (0). Flowers coral-red with orange throats. AM 1965. caliginis Phaeovireya (Vireya) Shrubs with long, narrow, straight-sided leaves covered with dense brown scales. Flowers (variable flowering time) are pink, cream, or lavender. Found in tropical rain forests in eastern areas on the island of New Guinea, Indonesia, Papua New Guinea 89/003 FRD (+32). Recently collected by Fran Rutherford in Papua New Guinea. callimorphum ssp. callimorphum Campyulocarpa Shrubs, 2 to 6 ft. Flowers (April-May) are white to rose-pink, sometimes with purple flecks and blotch. Free flowering from an early age. Native to thickets and rocky slopes at 9,000 to 11,000 ft. China 76/093 JHC (0). Pink flowers highlighted red at the base. 66/541 RBG (0). A form with small rounded leaves and white flowers with a crimson blotch. 86/001 JS (0). Deep pink flowers. callimorphum var. myiagrum Camplocarpa Shrubs, 2 to 6 ft. Flowers (April-May) are white and may have purple flecks or a faint blotch. Native to open rocky slopes and on cliffs from 10,000 to 13,000 ft. China 66/541 RBG (0). A form with small rounded leaves and white flowers with a crimson blotch. calophytum var. calophytum Fortunea Trees, 15 to 30 ft. Flowers (March) are pinkish-white to pale lavender with purple flecks and a basal blotch. A hardy species highly regarded for its stately bearing, handsomely dressed in lance-like leaves up to 15 inches. Grows in forests from 6,000 to 13,000 ft. China 64/063 CHP- MVW (-10). An unusual pink flowered form with a purple blotch. 77/130 ACB (-10). An unusual pink flowered form. calostrotum ssp. calostrotum Saluenensia Low shrubs to 3 ft. Flowers (April-May) are rose-crimson to rich purple with darker flecks. Attractive glaucous foliage with dense brown scales below. Found on stony alpine meadows and cliffs from 10,500 to 4,000 ft. N Burma, China 66/573 WIS (-5). A dwarf form with 3/4" leaves a striking grey-green in spring and rose-crimson flowers. 74/059 'Gigha' GIG: GLE- (-5). An award form with large rose-crimson flowers, and striking grey-green leaves. FCC 1971 83/109 ADM (-5). A form with-rose pink flowers. calostrotum ssp. keleticum Saluenensia Prostrate shrubs to 1 ft., with dark green leaves. Flowers (May) are pale to deep purplish-crimson with crimson spots. An easily grown ground cover with various forms in cultivation. Commonly found in open stony moorlands at higher elevations around 14,000 ft. NE Burma, China 66/595 (keleticum) GLE (-10). A form with flat faced purple flowers. 73/156 (keleticum) PHB (-10) 73/238 (syn. radicans) FRY: WW (-5). Rose-purple flowers. 75/196 (keleticum) Rock 58: CS (-10). A superior color form collected by Dr. Rock, with purple-crimson flowers. 77/804 (radicans) ACB (-5). A form with a prostrate habit and rose-lavender flowers. calostrotum ssp. riparium Saluenensia Dwarf shrubs to 5 ft. Flowers (May) are pink to purplish-magenta. A variety of collections have produced a varying assemblage of clones. Several different forms in cultivation from widely varying native habitats. Found in hillsides often beside steams and swamps at 10,000 to 15,000 ft. India, NE Burma, China 69/779 (calostrotum var. calciphilum) GLE - MVW (-5). Smallest leaves and most compact growth with light pink flowers. 73/199 (nitens) FR (-10). Form with light purple flowers. 80/084 (nitens) RBG Edinburgh (+5) campanulatum ssp. aeruginosum Campanulata Shrubs to 15 ft. Flowers (April-May) are pink, lilac or purple and often spotted. One of the finest foliage plants in the genus with outstanding metallic-blue new foliage. Grows on stony alpine slopes and ledges from 12,000 to 14,500 ft. N India, Bhutan, Nepal 68/757 Collarino-MVW (-5). Purple flowers. 84/078 K&P (-5). 76/200 RBG (-5). Form with purple flowers. campanulatum ssp. campanulatum Campanulata Shrubs or small trees to 35 ft. Flowers (March-May) are white, rose-pink to rose-purple and spotted with purple. This is a common and wide spread species with many introduced forms that are hardy and long lived. Found in mixed forests among scrub from 9,000 to 12,000 ft. N India, Nepal, Bhutan 64/031 ('Knaphill') WGP (-5). An award form with lavender- blue flowers. AM 1925 65/340 STO - UBC (-5). Flowers are pale lavender with faint spotting. 74/053 ('Roland Cooper') Cooper 5768: RBG (-5). An award form with white shaded mauve flowers. AM 1964 75/123 ('Waxen Bell') RBG (0). Purple flowers with darker spots in an Award of Merit form, 1965. campanulatum ssp. aeruginosum Campanulata Shrubs to 15 ft. Flowers (April-May) pink, lilac or purple, sometimes with darker flecks. One of the finest foliage plants in the genus with outstanding metallic-blue new foliage. Grows on stony alpine slopes and ledges from 12,000 to 14,500 ft. in N India, Bhutan, and Nepal. 76/200 RBGE ((5). Purple flowers. 4-8", 76/235 BROD ((5). Red-purple flowers. 4-6" campylocarpum ssp. caloxanthum Campylocarpa Elegant mid-sized shrubs, 3 to 6 ft. Flowers (April-May) are creamy to sulphur-yellow often orange in bud. Free flowering. Native to the margins of scrub and forest on rocky slopes and cliffs at 10,000 to 13,000 ft. NE Upper Burma, China 65/522 (telopeum) KW 6868-Windsor (0). Deep yellow buds open to light yellow flowers. 75/063 (caloxanthum) Forrest 27123: WAK (-5) campylocarpum ssp. campylocarpum Campylocarpa Shrubs or small trees, 3 to 20 feet. Campanualate flowers (April-May) are pale to bright yellow tinged with red in the bud, with or without a crimson basal blotch. Leaves elliptic to oblong-elliptic and glabrous at maturity. Found in mixed woodlands of oak, birch, spruce often ith other rhododendrons such as R. campanulatum, in coniferous forests of fir or hemlock, and among rocks on open hillsides from 9,500 to 14,000 ft. E Nepal, India (Sikkim, Arunachal Pradesh), Bhutan, China (S Tibet). 76/047 FR (+5) 76/307 TRE (0) 73/047 ROBB (+5). FCC 1892. 82/173 JORG (0?) campylogynum Campylogyna Dwarf shrubs, 2 inches to 3 ft., occasionally to 4 ft. Flowers (May) are pink to salmon-pink, red, claret, purple, plum to almost black-purple, or cream. The campanulate blossoms resemble small thimbles nodding at the end of long pedicels. Great variation in foliage, flower and habit with many clones in cultivation. Prostrate and compact forms are especially choice. Found in a wide range of habitats including moorland, alpine scrub, and cliff ledges from 9,000 to 14,000 ft. India (E Arunachal Pradesh), N Burma, China (NW Yunnan, SE Tibet). 62/043 GLE (0). Salmon-pink flowers. 66/664 WW (0). Form with plum-purple bells elevated above the foliage. Noted for its dense dwarf habit, like spreading boxwood, growing to only twelve inches in as many years. 70/376 (var. myrtilloides) WIS - UBCP (0). The dwarfest form with the smallest leaves and flowers. Flowers are plum-purple. 74/063 (var. leucanthum) GLE (0). An award form with ivory-white flowers. AM 1973 77/707 (var. haropoeum) RBG (0). Dwarf form with large one inch pink flowers. 77/709 (var. myrtilloides) Forrest 18030: RBG (0). A very dwarf form with light cherry flowers. 82/159 (var. cremastum) HYD - JCB (0). Form with bright reddish-purple flowers. 83/103 ADM (0). A form with pink flowers. 74/062 (campylogynum var. charopeum) GLE (0). Dusky pink flowers with darker flecks. camtschaticum Theororhodion Dwarf deciduous shrubs to 1 ft. Flowers (May-June) are purple, reddish-purple, pink or white. Native to western Alaska and the Aleutian Islands, the Kamchatka Peninsula to Ussuri, Sakhalin Island and the Kurile islands, and the islands of Hokkaido and northern Honshu. Found in low areas on gravelly loam, rocky crevices, and frequently on hilltops. USA, USSR, Japan 73/054 UBC (-15). Purple-rose flowers. 76/009 WEB (-15) IJ-026 (-15). Seedlings from a reddish-pink form. canadense Rhodora (Azalea) Deciduous shrubs to 3 ft. Flowers (April-May) are pale to deep rose-purple or white. The most northerly of all North American azaleas. Grows on river banks, in swamps, and woodlands. Found in the provinces of Labrador, Newfoundland, and Quebec south through the state of Maine to northern New Jersey and west into Pennsylvania and central New York. Canada, USA 77/801 HLL: WWES (-30). Seedling selection with lavender-purple flowers and good fall color. 78/034 JC: KWG (-30). White flowers. canescens Pentanthera (Azalea) Deciduous shrubs to 15 ft., sometimes stoloniferous. Flowers (April) are pale to deep pink or white, rarely with a yellow blotch and often fragrant. Flowers usually appear before the leaves which may or may not have a glaucous or whitish coating. A common and aggressive deciduous species mounding over large areas of low moist woodlands and along streams of coastal plains. SE USA. 76/277 HTS 14: USNA (0). Collected in Columbia County, Florida. 76/278 HTS 1277A: USNA (0). Collected in Camden County, Florida. Pink lobes and rose tubes. 78/111 KWG (0). Collected wild in Muskogee County, Georgia. 83/089 VAR (0). A form with pink flowers. capitatum Lapponica Compact upright shrubs to 5 ft. Flowers (March-April) are pale lavender to bluish-purple. Native to moist meadows and mountainsides from 10,000 to 14,000 ft. China 74/064 GLE (0). Form with lavender flowers in early April. carneum Maddenia Shrubs to 3 ft. Flowers pink to faintly pink. Leaves elliptical and dark green. Known only in cultivation. Collected material believed to have originated in the northern Shan States of Burma. 77/687 BRO (+20). Form with light "flesh" pink flowers. carringtoniae Sollenovireya (Vireya) Shrubs to 15 ft. or more. Flowers (January, June) are white with salver-shaped corolla. Thick leaves in pseudowhorls are obovate to elliptic-obovate in shape. Found on open hillsides, steep slopes, and among rocks at the edges of rivers from 6,000 to 8,000 ft. Native in the Owen Stanley Mountains of Papua New Guinea. 85/049 PS: DC (+32) 87/040 RBG (+32). catacosmum Neriiflora Shrubs, 4 to 10 ft. Flowers (April) are crimson and of a fleshy substance. Leathery leaves with a dense wooly indumentum. Distribution limited in the wild. Found on forest margins and cliffs at 12,000 to 14,400 ft. China 67/689 Rock 11185: WGP (0). Leaves with cinnamon indumentum. Flowers large and deep red. 82/195 HIL: AC (0). catawbiense Pontica Shrubs, 6 to 10 ft. Flowers (April-May) are lilac-purple, various shades of pink, rose-pink, or rarely white, and with faint flecks. One of the hardiest of all species and a parent of many hybrids. Native to North Carolina and Virginia. Found on rocky exposed mountain slopes from 150 to 6,600 ft. E USA 75/134 ('catalga') GAB (-20). High domed trusses of clean white flowers in May. 77/620 GAB: RAU (-20). A red-rose form with distinct white stamens. caucasicum Pontica Dwarf shrubs 1 to 3 ft. Flowers (May) are white to yellow with greenish flecks. Very hardy. Rare in cultivation. Found in rocky mountainous areas at 6,000 to 9,000 ft. Turkey, USSR 79/125 GLE (0). Yellow form, collected in Turkey. cephalanthum ssp. cephalanthum Pogonanthum Dwarf shrubs to 4 ft. Flowers (April-May) are white to pink, rarely yellow. One of the most beautiful species with neat foliage and clear pink narrow tubular flowers. Found over large areas of moist moorland and dry rocky slopes at 10,000 to 14,500 ft. Burma, China 80/075 F.23400-Castle Howard (0). This clone grows into a dense low mound with deep green oblong leaves less than an inch in length and blooms in small clustered heads of delicate pink. 84/085 (cephalanthum var. nmaiense) K&P (0). Form with yellow flowers, upright habit. cerasinum Thomsonia Shrubs, 4 to 14 ft, but usually medium-sized. Crisp foliage and flowers (May-June) are charming bells of crimson or white with a deep pink border. Bicolor form rimmed with a cherry colored band. Found in conifer forests at 10,500 to 12,500 ft. NE Burma, China 66/610 BEN: UBCP (+5). 73/057 PHB (0). Form with cherry-red flowers. 80/046 ('Coals of Fire') KW 5830: BH (0) 80/110 KW 5830:HER (0). Flowers white with a pink border. 82/074 ('Beer Sheba') KW 6923: EXB: UBC (0) 83/014 WEB (0). Flowers cream edged with red. 83/017 WEB (+5). 82/075 'Beer Sheba' KW#6923:EXB:UBC (0). Flowers dark burgundy-red. 82/147 SOF (0). Light pink flowers from a red bud. 8-12" chamaethomsonii var. chamaethauma Neriiflora Dwarf shrubs up[ to 3 ft. Flowers (March-April) are pale to deep pink. Found on rocky slopes among boulders at 13,000 to 15,000 ft. China 70/031 FR (0). Form with pink flowers. chamaethomsonii var. chamaethomsonii Neriiflora Dense, dwarf shrubs up to 3 ft. Flowers (March-April) are carmine to crimson to scarlet. Mounding habit, growing among boulders on rocky slopes at 13,000 to 15,000 ft. China 66/545 GLN - GLE (0). Form with one-inch rounded, shiny leaves, and surprisingly large red flowers. 83/107 F 21723: ADM (0). Form with red flowers. charitopes ssp. charitopes Glauca Medium sized shrubs, 1 to 5 ft. Flowers (April) are apple blossom pink, sometimes spotted. Leaves glaucous below, smooth, shiny, peeling bark on older plants. Found on cliffs and rocky slopes at 10,500 to 14,000 ft. NE Burma, China 75/320 Nymans-UBC BG (0). Delicate pink flowers highlighted with red spots. 78/072 BRO - UBC (0). Form with delicate pink flowers. 84/081 BEN: K&P (+5). Pink flowers. christianae Euvireya (Vireya) Tropical shrubs to 10 ft. Flowers (variable flowering time) are deep yellow to orange with salmon or orange lobes. Native to Eastern New Guinea in open edges of forests from 2,000 to 10,000 ft. 78/101 D. Stanton-FM (+32). Flowers in threes, the corollas deep fluted cups of clear lemon yellow with soft orange flared rims. 83/072 ('Sunset') PS (+32). Form with deep yellow-orange flowers. 85/029 WIT - USDA 489704 (+32). Form with yellow to orange flowers. 82/208 BOS (+32). Pale orange flowers. christii Euvireya (Vireya) Tropical shrubs to 4 ft. Flowers (variable flowering time) have red tubes and yellow lobes. Distinctive heart-shaped leaves on a plant with striking bicolor pendulous flowers. Found as an epiphyte in mossy shrubs and on grassland treeferns, or terrestrial in rain forests or on cliffs from 4,000 to 13,200 ft. Papua New Guinea. 83/055 PS (+32). Red tubular flowers with yellow lobes. chrysodoron Boothia Bushy shrubs to 5 ft. Flowers (February-March) are various shades of yellow. Found in the Adung valley in upper Burma and possibly to the south in western Yunnan Province, China. Grows as an epiphyte or terrestrial among scrub and rocks from 6,500 to 8,500 ft. N Burma 76/218 GLN (+20). Flowers are a bright canary-yellow. ciliicalyx Maddenia Shrubs to 10 ft. Flowers (March-April) are white or pink and openly funnel-campanulate. Leaves elliptic or narrowly elliptic with dense brown scales beneath. Slightly hardier than other species of this alliance and flowers can be scented. Limited distribution in the wild: rocky slopes from 7,500 to 9,000 ft. China (Yunnan) 82/013 'Charisma' KW 20280-Pukeiti (+32) ciliatum Maddenia Shrubs to 6 ft. Flowers (March-April) are white, usually flushed with pink. One of the hardiest of the Maddenia's. Variable in flowering time, size and color of flower. Commonly found on hillsides and forested slopes at 8,000 to 13,000 ft. Nepal,India,Bhutan,China 80/077 LS&H 16019-Castle Howard (+10). 82/172 HED#378:HED (+10). White flowers with a slight rose blush in this form collected by Milke Danda in Nepal at 11,500 ft. cinnabarinum ssp. cinnabarinum Cinnabarina Upright shrubs to 15 ft. Tubular pendulous flowers (May) are coppery red to yellow or orange. Attractive glaucous foliage. Found on forest margins and hillsides from 9,000 to 13,000 ft. Nepal, India, Bhutan, China 64/139 (var. blandfordiiflorum) Corsock (+5). Graceful tubular flowers of a red-apricot-yellow blend. 70/019 (var. roylei 'Vin Rose') Windsor (+5). Slender upright plant with pendulous open tubular flowers of plum-crimson. An Award of Merit form, 1953. 74/066 'Nepal' LS&H 21283: HYD (+5). Clusters of four to eight pendulous flowers of light orange, deepening to red at the base. AM 1977. cinnabarinum ssp. xanthocodon Cinnabarinum Upright shrubs to 20 ft. Flowers (April-May) are yellow to apricot to purple. Flower shape is broader and more open flowers than other subspecies of this group with unusual color combinations. Beautiful blue-green leaves often aromatic. Found on steep hillsides and forests at 10,000 to 13,000 ft. India, Bhutan, China 70/323 (syn. concatenans) FOR (+5). Form with large apricot-orange bells, foliage especially silvery blue in this clone. 73/305 (syn. xanthocodon) EXB - WW - PHB (0). A reliable medium sized shrub producing the best display of yellow flowers in the genus. AM 1935 75/046 (syn. concatenans) KW 5874-Nymans (0) An Fcc form of a Kingdon Ward collection with apricot flowers flushed rose on the outside. 75/251 (syn. concatenans) WEB (0). A form typical in rounded glaucous leaves but the finest flowers of any in Mr. Davidian's opinion. 77/670 (syn. cinnararinum var. purpurellum) CRA (+5). Purple flowers. 80/078 (syn. concatenans) L&S 6560: CH (0). From the 1938 expedition by Ludlow, Sheriff & Taylor to southeastern Tibet. 82/001 (syn. cinnabarinum var. purpurellum) CI: LB (0). An Award of Merit form, 1951. 82/161 (syn. concatenans) JCB (0) Vermillion flowers in this form. citriniflorum var. citriniflorum Neriiflora Dwarf shrubs to 5 ft. Flowers (April) are yellow to orange to pink flushed with red. Common on alpine moorlands and cliffs at 13,000 to 15,000 ft. China 70/143 BRO: UBC (0) Light yellow flowers. citriniflorum var. horaeum Neriiflora Dwarf shrubs to 5 ft. Flowers (April) are orange-red to carmine. Found among boulders and cliffs of alpine moorlands at 13,000 to 15,000 ft. China 76/139 F 21850:RBG (0) clementinae Taliensia Slow growing shrubs, 3 to 10 ft. Flowers (April) are white to deep rose with purple flecks. Leaves blue-green and convex-shaped with thick white to buff indumentum. Native to open forests among boulders from 11,000 to 13,000 ft. China 74/067 Greig-UBC (0) 83/028 DAW: TJ (0) coelicum Neriiflora Shrubs to 5 ft. Flowers (April-May) are crimson and very fleshy. Rounded leaves with fawn-colored indumentum. Found growing in shaded scree on cliffs and in bamboo at 9,000 to 14,500 ft. Burma, China 80/059 F 21830: MIN RKB (+5). An award form with crimson flowers. collettianum Pogonanthum Bushy shrubs to 3 ft. Flowers (May) are white, But buds are pink. Rare both in the wild and in cultivation. Native to steep rocky and stony slopes at 10,000 to 13,000 ft. Afghanistan, Pakistan 77/710 Wendelbo 8975-RBG (0) commonae Euvireya (Vireya) Tropical shrubs to 5 ft. Flowers (variable flowering time) are deep red to purplish crimson. As plants mature they can develop a truss of up to 6 flowers. Found on the island of New Guinea. Native on the edges of swamps or margins of Papuacedrus forest, exposed ridges, and in rocky areas from 6,500 to 13,000 ft. Indonesia, Papua New Guinea 79/035 PRA (+30) Red flowered, high elevation Vireya collected at Daulo Pass in New Guinea. concinnum Triflora Shrubs, 2 to 15 ft. Flowers (April-May) are purple to reddish-purple. Quite commonly cultivated with many forms and generally hardy. Found in woodlands and thickets at 7,500 to 14,500 ft. China 64/177 (concinnum var. benthamianum) RBG (-5). Form with lavender-purple flowers. 64/180 (concinnum var. pseudoanthinum) WIS (-5). This form possesses flowers among the loudest in color of the whole genus, emphatic ruby-red. 64/209 ('Chief Paulina') DJ - GC - MVW (-5). Compact habit, ovate leaves and royal-purple flowers. 75/313 (concinnum var. pseudoyanthinum) CHP (-5). Form with ruby-red flowers. 84/010 (concinnum var. benthamianum) ARD (-5) coriaceum Falconera Shrubs or small trees, 10 to 25 ft. Flowers (April-May) are white, sometimes flushed rose, with a crimson blotch. Native to conifer forests and thickets from 10,000 to 14,000 ft. China 83/153 WGP (+15) coryanum Argyrophylla Shrubs to 20 ft. Flowers (April-May) are creamy-white to white, with crimson flecks. Small but plentiful flowers in a loose truss. Native to forests and dense thickets from 11,000 to 14,000 ft. China 80/111 MM:Her (0) cowanianum Lepidota Deciduous shrubs to 8 ft. Flowers (May) are pink to purple-magenta to deep wine. Native to open slopes, on the edges of forests, or in deep gorges at 10,000 to 13,000 ft. Nepal 79/184 VVN: KWG (+5) crutwellii Solelnovireya (Vireya) Small tree 15 to 20 ft. Flowers (June-August) are pure white. Found in thin evergreen forests, in gullies, among non- calcareous rocks in shade and on moss-covered ground an 6,100 to 8,500 ft. New Guinea 83/054 PS (+32). Pure white flowers. culminicolum var. angiense Euvireya (Vireya) Shrubs or small trees to 16 ft. Flowers (January-December) are red to purple, sometimes reddish-pink. Found in devastated Nothofagus forests or forests borders and more open summit areas at 4,000 to 7,500 ft. Common locally. NW New Guinea 83/059 PS (+32). cuneatum Lapponica Shrubs, 3 to 6 ft. Flowers are deep purple to rose-lavender or rarely white. With large leaves and flowers that are atypical of this subsection. Found on mountainous slopes at 10,000 to 13,000 ft. China 65/497 GLE (0) Form with rose-lavender flowers. 69/106 Barto (0) cuprescens (possible hybrid of R. phaeochrysum and R. aganniphum) A shrub 3 to 15 ft. Flowers (March-April), are white, sometimes flushed pink, with crimson spots. Collected in Sichuan, China 79/146 Goteborg BG (0) cyanocarpum Thomsonia Shrubs or small trees, 3 to 15 ft. Flowers (March-April) are white or cream to clear pink with darker nectar pouches. Grows in open pastures and margins of forests from 10,000 to 13,500 ft. China 77/731 ( syn. cyanocarpum var. eriphyllum) F 15570: WGP (0) This form is from seed collected in NW Yunnan by George Forrest during his 1917-19 expedition. D dalhousiae var. dalhousiae Maddenii Epiphytic or, rarely, terrestrial shrubs to 10 feet. Tubular-campanulate flowers (April-July) are white, cream, or pale yellow, often with a yellow throat, and may have a strong fragrance. Beautiful peeling cinnamon-brown bark. 6,000 to 8,000 feet. China (SE Tibet), India (Sikkim, W Bengal), E Nepal, Bhutan. 84/128 'Frank Ludlow' LS&T 6694: BH (+25). White flowers and yellow blotch. FCC 1974. dalhousiae var. rhabdotum Maddenia Sprawling shrubs to 12 ft. Flowers (April-May) are white or cream, often flushed yellow inside, and outside with five red lines running from the base of the corolla to the tip of each lobe. The broad red stripes on the outer surface of the petals make this one of the most fascinating rhododendron flowers available. Requires a relatively warm climate to grow outside or can be grown in a greenhouse, Epiphytic in rain forests or terrestrial on hillsides and dry rocky areas from 5,000 to 9,000 ft. India, China 77/703 (rhabdotum) BRO (+32). Broad tubular flowers creamy-white with the characteristic bold red stripes. dauricum Rhodorastra Semi-deciduous shrubs, 2 to 5 ft. Flowers (February-March) are pink or violet to purple or white. One of the first species to flower. Purple-bronze leaves in winter. A widely distributed and variable species with dwarf forms. Found in dense thickets in mixed forests from river valleys to mountainsides. Japan, China, Mongolia, E USSR 74/008 'Midwinter' WEB (-25). Our earliest-blooming form. Red-purple flowers. FCC 1969. 76/019 WEB (-25). Dwarf form. 76/348 'Hollaido' Wada-WE Berg (-25). A white flowered award winning form the blooms one month later than others. Award of Merit. 77/600 (ledebourii) USNA ((25). Rose-purple flowers in this clone collected in the former USSR. 82/131 (sichotense) MBG (-25). Form with soft lavender flowers, collected in the USSR. 82/165 JCB (-25). Dwarf form, collected near Baikal, USSR davidsonianum Triflora Shrubs, 2 to 18 ft. Flowers (April) are pink to lavender, tinged with pink. A very floriferous species. Commonly found in thickets and on forest margins at 6,500 to 11,000 ft. China 63/007 WGP (+10) 64/129 'Caerhays Pink' CAE (+10). Form with pink spotted red flowers. decorum Fortunea Shrubs or small trees to 20 ft. Fragrant flowers (May-June) are white to pale pink, with or without green or crimson lecks. Widespread in dry open forests and among scrub from 6,000 to 12,000 ft. Burma, China 64/062 PC: CHP: MVW (0). Light pink fragrant flowers. From seed selfed at Glendoick. degronianum ssp. degronianum Pontica Shrubs, 2 to 5 ft. Flowers (April-May) are pink to soft rose with conspicuous flecks. Compact habit is found in several cultivated varieties of this popular hardy species. Found on hilltops and mountain ridges from 660 ft. To 4,000 ft. Japan 67/708 RBG (0). 70/064 ('Rae's Delight') ACB-CHP (-10). Form with a slow spreading habit and flowers almost red in bud, opening deep vibrant pink. degronianum ssp. heptamerum var. heptamerum Pontica Shrubs, 2 to 5 ft. Flowers (April-May) are pink to soft rose with conspicuous flecks. A variable plant with excellent oliage. Smooth shiny leaves covered below with a thick fawn-grey to orange to rust indumentum. Grows on hilltops and mountain ridges from 600 to 4,000 ft. Japan 65/281 (metternichii) BH (-15). Form with light pink flowers with darker veining and spots. 73/181 (metternichii) USDA 330367 (-15). 76/111 (metternichii var. micranthum 'Enamoto') WEB (-15). Flowers are pink to soft rose, compact habit. 80/003 (metternichii Ho Emma') BH (-15). Flowers white flushed red-purple. 83/208 (metternichii) TOD (-15). Form with pink flowers. degronianum ssp. heptamerum var. kyomaruense Pontica Similar to var. heptamerum but with flowers only having 5 lobes and native only to central Honshu, Japan. 75/139 (metternichii var. kyomaruense) BERG ((15). White flushed rose flowers with stunning silvery white indumentum on the newly emerged foliage, persisting on the underside. degronianum ssp. yakushimanum Pontica Dense mounding shrubs, 3 to 8 ft. Light pink or rose buds open to white or white flushed pink flowers (May) with or without faint pink flecks. The dwarf to semi-dwarf habit, foliage with thick white to fulvous indumentum, and exceptional flowers make this a popular species. Native solely to Yaku Island, Japan in coniferous forests and on exposed mountain slopes from 1,500 to 6,500 ft. The 2 accessions offered this year are the two original clones of this species introduced from Japan. 64/012 'Koichiro Wada' (yakushimanum 'Koichiro Wada') WIND:CHI ((15). A 1947 FCC form, similar to the Exbury form. 75/241(=75/260) 'Exbury Form' (yakushimanum 'Exbury Form') EXB:BERG ((15). Perfect dome-shaped habit, deep green, heavily indumented foliage and apple- blossom pink flowers. dendricola Maddenia Shrubs to 15 ft. Flowers (May) are white or white flushed pink often with a yellow or greenish blotch. Fine greenhouse plant in colder climates or outside where temperatures do not go below freezing. Dark purple to mahogany-red peeling bark. Often grows as an epiphyte, hence its Latin name, dweller on trees. Also found growing on rocks, cliffs, and the margins of thickets from 3,500 to 5,500 ft. India, NE Burma, China 81/126 (taronense) SA- EK (+32). Form with white flowers. detonsum (natural hybrid of adenogynum) Shrubs, 3 to 10 ft. Flowers (May) are pink with purple flecks. Included for historical interest. Collected at the Sungkwei divide, Yunnan from 10,000 to 11,000 ft. on rocky slopes. China 76/189 RBG (0). 77/673 CRA (0). Flowers pink with purple flecks. dianthosmum Phaeovireya Tropical shrubs, 2 to 7 ft. Flowers (variable flowering time) pure white with the scent of carnations. Native to New Guinea where it is typically epiphytic in rain forest from 2,600 to 4,600 ft., descending along gorges down to 1,600 ft. 83/063 SCHI (+32). diaprepes Fortunea Shrubs or small trees to 45 ft. Fragrant flowers (June) are white, sometimes flushed rose and heavily scented. Native to mixed subtropical forests and open thickets from 6,000 to 11,000 ft. Burma, China 75/104 'Garganyua' WGP (0). An award form with large white flowers shaded green toward the base. Triploid. AM 1953, FCC 1974 dichroanthum ssp apodectum Neriiflora Shrubs, 2 to 6 ft. Flowers (May) are orange-apricot or orange flushed salmon-rose. Oval leaves with silver to fawn indumentum. Found on rocky slopes and as an under shrub at 9,000 to 12,000 ft. NE Upper Burma, China 77/732 WGP (+5) dichroanthum ssp. scyphocalyx Neriiflora Shrubs, 2 to 6 ft. Flowers (May) are orange-red, occasionally yellow flushed red or carmine. Leaves with thin fawn to gray indumentum. A variable subspecies with orange shades much used in hybridizing. Found on open rocky slopes and ravines at 9,000 to 12,000 ft. NE Upper Burma, China 65/307 CRA (+5). Bronze-orange bells that reminded Kingdon-Ward of marmalade, but glow like orange stained glass when the light shines through. 66/560 (dichroanthum ssp. herpesticum) F 27089: WGP (0). Light persimmon orange flowers on a dwarf spreading plant under 2 ft. in height. 80/047 BH (+5) 82/175 TC-TJ (+5). Form with orange flowers. dielsianum Phaeovireya (Vireya) Small tropical shrubs to 3 ft. Pink flowers (May-September). A relatively easy to grow species that roots readily from cuttings. Epiphytic in rain forest canopy or terrestrial in open grassy areas from 4,000 to 6,500 ft. Papua New Guinea 83/060 PS (+32). Pink-flowered form collected wild in New Guinea. 85/019 USDA 354304 (+32). Light pink. 85/022 USDA 354305 (+32) E eclecteum Thomsonia Shrubs, 2 to 8 ft. Flowers (January-April) extremely variable in terms of both bloom time and color. Can be white, pink, rose, purple, salmon, red, or yellow, including various shades of each and bicolored forms. May be heavily marked with flecks or blotches or not marked at all. Native to Upper Myanmar and China (NW & W Yunnan, SE Xizang, and SW Sichuan). Occurs in various habitats from 10,000 to 14,000 ft. 77/735 (eclecteum var. brachyandrum) KW#5732:WIND (+5). Crimson flowers in this form. edgarianum Not listed in the reclassification by Dr. J. Cullen. Considered by other authorities to be a natural hybrid of R. nivale ssp. boreale or synonymous with R. tapetiforme. Upright or mat-forming shrubs to 3 ft. Wide, funnel-shaped flowers (May-June) are blue-purple and valued because they appear later than most species in the Lapponica subsection. Grows on moorlands and among heaths at 12,000 to 16,000 ft. China (Yunnan, Sichuan, SE Tibet). 84/082 K&P (0) edgeworthii Edgeworthii Shrubs to 10 ft. Flowers (April-May) are white or pale pink and deliciously fragrant. Attractive bullate leaves with rust-colored to fawn indumentum. Perfect drainage and some protection needed from winds and frost. Often found growing as an epiphyte on trees and rocks up to 13,000 ft. India, Bhutan, E Burma, China 65/383 (bullatum) BOD (+15). An Award of Merit form with blush pink, scented flowers. AM 1946 73/030 (syn. bullatum) FM: CS: PHB (+10). White flowers flushed pink with a fragrance reminiscent of carnations. 84/038 RBG: MCK (+15) elegantulum Taliensia Shrubs to 6 ft. Flowers (March-April) are purplish-pink with crimson spots. Velvety leaf indumentum. Limited distribution in the wild. Found among conifers on rocky slopes and in meadows at 12,000 to 13,000 ft. China 81/129 UWA (0). Small leaf form. elliottii Parishia Shrubs to 30 ft. Flowers (May-June) are scarlet to crimson or rose-purple with darker flecks. Hybridizers have found the red-flowered forms of this species very valuable in making crosses. Native to the states of Naglaland and Manipur in India from 8,000 to 9,000 ft. NW India 77/561 JHC (+25) ellipticum Choniastrum Shrubs to 15 ft. Flowers (March-April) are white to pink to purple. Native to subtropical forests, on stream banks and gravelly slopes at 100 to 8,000 ft. China, Taiwan 73/094 USDA 325023: (+10) Form with lightly grayed-pink fragrant flowers in early May. eriocarpum Tsutsusi (Azalea) Shrubs to 3 ft. Flowers (July) are red to purple, rose, pink or white. Natural hybrids of this species and R. indicum, which grow together on Yaku Island, are considered the first of the Satsuki Hybrids. With a limited distribution on Kyushu sland and those to the south including, Tanegashima, Yakushima, and Takarashima in thickets and open woodland. Found at low elevations from sea level to rocky hillsides. Japan 80/014 (tamurae) USNA (+10). From seed collected on Yaku Island, Japan. erosum Barbata Trees to 20 ft. Flowers (March) are rose-pink to crimson. Limited distribution in the wild among fir forests at 9,000 to 12,500 ft. China 65/251 STR: UBC (+10). Form with rose-pink flowers. 76/024 REU: VVN (+10). eudoxum var. eudoxum Neriiflora Shrubs to 4 ft. Flowers (April) are rose-pink to carmine, rarely white. Found on rocky slopes, thickets, gullies and cliffs at 11,000 to 14,000 ft. China 76/GLE: DG: VVN (+5). Bright rose flowers. AM 1960. 76/174 R 59483: RBG (+5) exasperatum Barbata Shrubs, 3 to 15 ft. Flowers (March) are brick-red, scarlet or dusty pink. Young foliage is purplish-green. Found on open ridges, dense thickets and fir forests at 9,500 to 12,000 ft. India (Arunachal Prakesh), NE Burma, China (SE Tibet). 76/137 KW 8250: RBG (+10). Red flowers. 81/139 KW 8250: RBG (+10) F faberi ssp. prattii Taliensia Shrubs to 10 ft. Flowers (April-May) are white sometimes with a scarlet basal blotch. Beautiful foliage with slightly larger leaves than related subspecies. Native to thickets and cliffs from 8,500 to 14,000 ft. China 67/683 (prattii) Corsock 2nd prize (0). 80/115 (prattii) HER (0) 84/059 (prattii 'Perry Wood') BRO (0). Flowers white flushed red-purple in the throat. Am 1967 falconeri ssp. eximium Falconera Trees 10 to 30 ft. Flowers (April-May) are pink to rose with darker tips. Limited distribution in the wild. Found in moist shady mixed forests at 9,000 to 11,000 ft. India 77/738 (eximium) WGP (+10) falconeri ssp. falconeri Falconera Trees to 40 ft. Flowers (late April) are creamy-white to almost yellow with a purple basal blotch. The flowers are heavy and waxy and very long lasting. Native to forests of mixed conifers and deciduous trees from 9,000 to 12,500 ft. E. Nepal, N. India, Bhutan 75/250 WEB (+15) farrerae Brachycalyx (Azalea) Semi-evergreen shrubs to 2 ft. Flowers (June) are pale lavender to dark purplish-pink with crimson flecks. Native to mountainous regions at 6,500 ft. China 78/037 REU-WEB (+20). Form with light lavender flowers. fastigiatum Lapponica Prostrate shrubs usually under 2 ft. Flowers are bright lavender-blue to pinkish purple. One of the best dwarfs of this subsection as it is relatively easy to grow. More vigorous than R. impeditum, many forms have excellent glaucous foliage. Found on cliffs and stony edges of forests at 11,000 to 14,500 ft. China 73/101 J. Henry-PHB (0). Tight dwarf with grayed new growth and bright purple flowers. 75/258 Rock 84: ACB (-15). Form with bright purple flowers. 81/140 Forrest 5847: RBG (-15). Form with lavender-blue flowers. faucium Thomsonia Erect shrubs, 5 to 21 ft., with smooth glossy bark. Flowers (March-May) are pale rose to white flushed rose or sometimes sulphur yellow, usually with purple spots. Similar and closely related to R. hylaeum. Native only to SE Xizang, China where it grows on rock faces and in forest margins from 8,500 to 11,000 ft. 80/089 LS&E 12045: RBG (+10). Form with pink flowers. ferrugineum Rhododendron Shrubs to 5 ft. Flowers (June) are pale to deep pink or white. Commonly called the Alpine Rose and brought into cultivation in 1739. Found in the Pyreness of France and Spain and the Alps of France, Switzerland, Italy, Germany, and Austria. Occurs on mountain slopes, open woodland, and moorland at 3,000 to 7,000 ft. C Europe 76/381 GLE: UBC (-10). Form with pink flowers. flammeum Pentanthera (Azalea) Shrubs to 8 ft. Flowers (May) are scarlet, orange to pink, salmon and yellow. A heat tolerant species that may be less hardy than more northern American azaleas. Deciduous, with reddish-orange autumn leaves. Limited distribution in Georgia and South Carolina. Found at low elevations in the shade or red clay bluffs, open woods and on wooded slopes. SE USA 75/030 (syn. speciosum) FG (+5). Collected wild on Pine Mountain, Georgia. 76/286 (syn. speciosum) USNA (+5). Collected wild in Burke County, GA Red-orange flowers. flavidum var. flavidum Lapponica Columnar shrubs to 8 ft. Flowers (April) are pale yellow. A demanding species with very limited distribution in the wild. Native to alpine regions from 10,000 to 13,000 ft. China 73/106 FR-PHB (-5). Early light lemon flowers sparkle against shiny dark green leaves. 76/385 STR-UBC (-5). Form with yellow flowers. fletcheranum Maddenia Shrubs to 4 ft. Flowers (April) are pale yellow. Free flowering, has reddish-brown peeling bark. Hardier than most of its relatives and a parent of many dwarf yellow hybrids. Native to alpine forests from 13,000 to 14,000 ft. China 65/355 BRO (0). Flowers yellow in bud opening to pale yellow. 69/831 BRA: MVW (0). Light yellow flowers. 74/071 'Yellow Bunting' GLE (0). An Award of Merit form (1964) with soft yellow flowers. 76/105 WEB (0) floccigerum ssp. floccigerum Neriiflora Shrubs, 1 to 10 ft. Flowers (March-April) are usually crimson to scarlet, sometimes orange, yellow or pink. Early flowering. Commonly found on cliffs and open scrublands at 9,000 to 13,000 ft. China 69/763 GRE: MVW (+15) 69/764 Rock 32: CHP-MVW (0). Form selected for its bright orange-red pendulous flowers. floribundum Argyrophylla Upright shrubs or small trees to 20 ft., with indumented foliage. Flowers (April) are magenta rose fading to pink with crimson flecks and basal blotch. Flowers tend to have a bluish cast and appear at a young age. Native to woodlands from 4,000 to 8,500 ft. China 79/179 Exbury-UBC PP (-10). Tall shrub growing to 6 ft. in 10 yrs. Has flowers that are rose or purple with a dark crimson blotch. An Award form (AM). 65/279 W#4266:BOR ((10). Flowers rose-purple with a burgundy blotch and red-purple flecks. forrestii ssp. forrestiiNeriiflora Dwarf creeping shrubs rarely more than 6 inches high. Flowers (March-April) are crimson to scarlet. Leaves obovate to orbicular and often bullate. Found in dense thickets on steep hillsides, and on or among boulders and cliffs from 10,000 to 15,000 ft. in NE Myanmar, and China (NW Yunnan, SE Xizang). 75/263 (forrestii var. repens) GREI:ROBB (0). Red flowers in this form. forrestii var. tumescens Omitted form the new classification, a close relative of R. forrestii ssp. papillatum. Dwarf creeping shrubs, rarely over 6". Flowers (April) are crimson bells with larger leaves than other subspecies. Found at 11,000 to 13,000 ft. China. 78/090 Exbury-CHP (0). formosum var. formosum Maddenia Upright shrubs to 6 ft. Flowers (April) are white or white flushed pink, occasionally scented. A narrow leafed variety of a hardier member of this alliance. Native to hillsides and river banks from 5,000 to 7,500 ft. NE India 65/370 (iteophyllum) BRO (+20). Narrow leaf form of this variety. 81/122 RBG-EK (+15). Form with white-pink scented flowers. formosum var. inaequale Maddenia Shrubs to 6 ft. Flowers (April-May) are creamy white or greenish white and scented. Found in shady forests and on stream banks from 4,500 to 5,500 ft. NE India 71/085 (inaequale) LAM (+32). White scented funnels over three inches long. forrestii ssp. forrestii Neriiflora Dwarf creeping shrubs rarely exceeding 6 inches. Flowers (March-April) are crimson to scarlet. Can be difficult to grow well, but worth every effort. Found on boulders in moist stony pastures at 10,000 to 15,000 ft. China, Burma 75/263 (forrestii var. repens) GRE: FR (0). Form with red flowers. 76/373 KW:WEB (0). Prostrate form with red flowers. forrestii ssp. papillatum Neriiflora Dwarf shrubs to 18 inches. Flowers (March-April) are crimson to scarlet. Leaves pale fawn underneath and narrower than in ssp. forrestii. Often mound-forming. Native in dense thickets on steep hillsides, on or among boulders, and cliffs at 11,000 to 13,000 ft. China. 70/175 (syn. forrestii var. tumescens) R. 11169 (59174): GOR (0). Crimson flowers. 80/116 (syn. forrestii var. tumescens) HER (0). Dome shaped habit. fortunes ssp. discolor Fortunea Shrubs or trees up to 23 feet. Large funnel-shaped flowers (May-June) are white to shell pink and fragrant. Variable in flowering dates due to the wide range of collected material. Smooth oblong leaves. Grows from 3,000 to 7,000 ft. in open woods. China 66/561 (discolor) WGP (-5) 75/064 (discolor) WAK (-5). Form with fragrant white flowers. 75/136 (houlstonii) GAB (-10). Form with fragrant light pink flowers and a streaking red blotch at the base.. 82/140 (discolor) BRP This clone has pink buds opening to white flowers with yellow-green flecks.(-5) fortunei ssp. fortunei Fortunea Shrubs or trees to 30 ft. Flowers (May) are pale lilac to pale pink and fragrant. Leaves with purple petioles. Found in mountain woodlands at 2,000 to 3,000 ft. China 76/029 GAB-VVN (-10). Form with lilac-pink flowers. 76/340 HLL: CHP (0). 82/026 SLO: KWG (0). Light pink flowers. 83/168 BAL: GB (-10) fragariflorum Fragariflora Mounding dwarf shrubs rarely exceeding 1 ft. in height. Flowers (May) are strawberry-red to purple. A distinct species that is very difficult to propagate, thus rare in cultivation. Found on open hillsides and pastures from 12,000 to 15,000 ft. Bhutan, China 75/271 REU-DG (0). Form with bright pinkish-purple flowers. 81/141 LS&E 15828: RBG (0). Strawberry-red flowers. fulgens Fulgensia Shrubs, 4 to 15 ft. Flowers (March-April) are scarlet to blood-red, with darker nectar pouches. Often compact plants with indumented leaves and peeling reddish maroon bark. Native to mixed forests of conifers and rhododendrons at 10,000 to 14,000 ft. E Nepal, Bhutan, NE India, China 75/106 LEO-WGP (0). fulvum Fulva Shrubs or small trees to 25 ft. Flowers (March-April) are white to pink usually with a crimson basal blotch. Of exceptional garden value for the leaf indumentum, which is rusty-brown to fawn in color, and the peeling bark. Found in open thickets and conifer forests at 9,000 to 15,500 ft. China, Burma 64/156 CRA (0). Pink flowers in April. Leaf indumentum produces a cinnamon orange glow. 80/079 SUN: CH (0). White flowers. G galactinum Falconera Shrubs or trees, 15 to 20 feet. Flowers (May) are white or pale rose with a crimson basal blotch. Dark gray-green foliage with fawn to cinnamon indumentum. A distinct member of the Falconera Subsection because of its ovoid and tomentose terminal foliage buds and the ovary without hairs. This species collected only one time by E.H. Wilson in 1910. Limited distribution in western Sichuan province. Native to evergreen forests and thickets around 10,000 ft. China 75/165 FRY-WW (-5) 79/110 W 4254: BH (-5) genestierianum Genestieriana Shrubs to 15 ft. Flowers (April-May) are red-purple. Bark is smooth and purplish. Found in scrub, thickets and on forest margins at 8,000 to 14,000 ft. N Burma, China 77/690 KW 20682:BRO (+25). glaucophyllum var. glaucophyllum Glauca Upright or spreading shrubs to 5 ft. The campanulate flowers (April-May are pink to rose-red-purple, white, or flushed pink. This free-flowering species has lovely bluish-gray foliage with a markedly glaucous lower leaf surface. Leaves very aromatic. Occurs on ridges and in pine and rhododendron forests at 9,000 to 12,000 feet. E Nepal, India(Sikkim), Bhutan, China (SE Tibet). 65/491 COR (+10). Deep Pink flowers with darker spots. glaucophyllum var. tubiforme Glauca Shrubs to 5 ft. Flowers (April-May) pink or white flushed pink, rarely entirely white sometimes spotted inside and tubular-campanulate in shape. Forms large colonies in forest clearings and on rocky slopes at 9,000 to 12,000 ft. India, Bhutan, China 75/025 HIL (+5). Clear pink flowers. 76/233 BRO (0). Form with pink flowers in April. glischrum ssp. rude Glischrum Shrubs to about 10 ft. Flowers (May) are pink to purplish-pink. Bristled stems and hairy leaves are the outstanding feature of this species. Found only at 11,000 to 12,000 ft. in light woodlands and margins of forests. China 64/150 (rude) Glenarn-UBC BG (+5) goodenoughii Vireya Upright, branching tropical shrubs. Flowers (flowering time varies) are white. Coriaceous leaves, in pseudowhorls, are elliptic to obovate-elliptic in shape. Uncommon in cultivation and collected only once, from the slopes of Mt. Goodenough on the island of New Guinea. SE Papua New Guinea. 83/053 P. Schick (+32). White flowers. gracilentum Euvireya (Vireya) Tropical shrubs to 2 ft. Flowers (flowering time varies) red to pink. Makes fine basket plant. Native to mountain tops at 6,500 to 9,000 ft. Papua New Guinea 78/103 HW: FM (+32). Dark red tubular flowers. grande Grandia Large shrubs or loosely branched trees from 20 to 50 ft. Large leaves with a silvery or white indumentum on the underside. A large rounded inflorescence ("truss") with flowers (February-April) pale yellow, cream, pink or rose, with a purple blotch and spots. Native to evergreen and mixed forests and along riverbanks from 7,000 to 10,500 ft. in E Nepal, India (Arunachal Pradesh, Sikkim), Bhutan, and China (S Xizang). Especially common in Arunachal Pradesh, where it grows in dense temperate rain forests. 66/554 LOG (+10). 71/338 BROD (+10) 81/109 BS (+10). Form collected in Sikkim. griersonianum Griersoniana Shrubs, 5 to 10 ft. Hairy, funnel shaped flowers (June) are a distinctive geranium-scarlet, soft geranium to vermillion, bright rose, or soft crimson, with or without flecks. Leaves lanceolate, with fawn to light brown indumentum on the undersurface, and bristly branchlets and petioles. Found in thickets, coniferous and mixed forests, and in scrub from 7,000 to 9,000 ft. China (W Yunnan), NE Upper Burma. 77/284 LJP (+10) griffithianum Fortunea Shrubs or small trees, 4 to 30 ft. Fragrant flowers (April-May) white, white flushed pink, pink to rose, or rarely flushed yellow. In the parentage of many well known hybrids including 'Jean Marie de Montague', 'Pink Pearl', and the Loderi group. Somewhat tender in colder climates, but for warmer areas it is exceptional for its large, fragrant flowers. Found in open mixed woodlands from 7,000 to 9,000 ft. In E Nepal, NE India (Sikkim), and Bhutan. 81/115 SMI.B (+20). A clone grown from seed collected in Sikkim by Britt Smith. 80/099 BEN (+20). Flowers are pink fading to white. H haematodes ssp. chaetomallum Neriiflora Shrubs to 5 ft. Flowers (March-April) are blood-red. Attractive indumentum often persistent above and densely wooly below, fawn to red-brown. Extremely widespread in the wild. Native to open slopes, thickets, and bamboo forests from 10,000 to 15,000 ft. NE Burma, China 75/300 R 39: CHP (0). Brilliant red flowers. haematodes ssp. haematodes Neriiflora Small shrubs, 2 to 5 ft. Flowers (April) are scarlet to deep crimson. An excellent species in foliage and in flower. Leaves have a thick woolly indumentum. Many forms collected from plentiful and variable wild populations. Found in alpine thickets, open rocky slopes and meadows at 11,000 to 13,000 ft. China 77/742 WGP (0). An award form with bright scarlet flowers. FCC 80/118 HOB: TJ (0) 82/176 HOB: TJ (0) A hardy and small form in this clone. hanceanum Tephropepla Dwarf to semi-dwarf shrubs, 1 to 6 ft. Flowers (April-May) white to yellow. Most forms in cultivation are more dwarf than typically found in the wild. Restricted to a small area around Mt. Omei in Sichuan Province, China. Found in thickets and on cliffs from 4,000 to 5,000 ft 65/476 ('Nanum') ROW (-5). A much confused species with numerous plants bearing var. nanum labels, but not the combination of small leaves and bright yellow flowers of this clone. 70/008 FR (0). Bright green foliage and well shaped. heliolepis var. brevistylum Heliolepida Shrubs, 6 to 15 ft. Flowers (June) are white to rose-purple to violet, often spotted. Found in rocky gullies and conifer forests at 10,000 to 12,000 ft. China 66/622 (syn. brevistylum) WGP (-5). Cherry-rose flowers. 70/419 (pholidotum) Forrest 6762: RBG (0). Form with rose-pink flowers. heliolepis var. heliolepis Heliolepida Shrubs to 10 ft. Flowers (June) are white to soft to deep rose or rosy-purple with reddish, greenish or brownish spots in the upper lobes. Very aromatic foliage. Found in thickets and woodlands at 8,200 to 12,000 ft. China, NE Burma 65/374 RBG (0) 76/302 (fumidum) PC (0) 77/323 DG (0) Rose-pink flowers. Highly aromatic foliage. 84/002 CRA (0) hemsleyanum Fortunea Stout shrubs, 10 to 20 ft. Leaves have an interesting undulating margin which greatly adds to the attractiveness of the plant. Flowers (June-July) fragrant, white or white blushed rose with a yellow-green throat. Rare in the wild, it has been found only on Mt. Omei in Sichuan, China where it occurs in woods and thickets from 3,500 to 6,500 ft. 73/133 ROBB (+5). Flowers white with a yellow-green flair herzogii Siphonovireya (Vireya) Tropical shrubs to 7 ft. Salverform flowers (flowering time varies) are white or white flushed pink, scented. Shoots densely scaly. Native to the island of New Guinea. Rarely epiphytic, more often terrestrial in cliff faces, landslides, steep eroded banks or among heath scrub at 5,000 to 8,200 ft. Indonesia, Papua New Guinea 89/008 RBG 614126: RBG (+32) hippophaeoides var. hippophaeoides Lapponica Upright shrubs to 5 ft. Flowers (April) are bluish-purple to pale lavender. Lovely shades of lavender blue are among the most popular species of this subsection. Found on open marshy slopes at 8,000 to 15,500 ft. China 66/592 (fimbriatum) GLE (-10). Form with bluish-purple flowers. 73/135 FR (-10). Form with lavender-blue flowers. 77/611 (fimbriatum) Glendoick (-10). Gray-green leaves and soft lavender flowers. 78/115 SUN-CHP (-10). Form with violet-blue flowers. 80/067 R 11363 (USDA 59615):RBG: WGP (-10). hirsutum Rhododendron Compact and spreading shrubs to 3 ft. Flowers (June-July) are pink, rarely white. Leaf margins bristly. The first rhododendron to be brought into European cultivation in 1656. Common on the Alps of southern France, through Switzerland, Italy, Germany, and Austria, extending into northwestern Yugoslavia. Grows among dwarf conifers and scrub on steep slopes and limestone formations from 1,500 to 6,000 ft. C Europe 66/594 GLE (-5). Form with rose-pink flowers. 82/123 KWG (-5). Pink form collected in Austria. hirtipes Selensia Shrubs or small trees to 20 ft. Flowers (March-April) white, with or without pink stripes, white flushed pink, pink or rose, with or without a blotch and flecks. Bristly hairs on leaf petioles. Native to SE Xizang, China. Grows in rocky areas above timberline forming dense scrub, in forests of spruce and fir, shady ravines, swamps, and on cliffs from 10,000 to 14,000 ft. 75/049 KW#6223:NYM (0) 64/097 WGP (0). Form with flushed pink flowers. 70/161 L&S 3624: GLN-UBC (0). An award form with pink flowers. AM hodgsonii Falconera Shrubs or small trees, 20 to 30 ft. Flowers (April) are pink to magenta or purple with a darker basal blotch. Hardier than most of its relatives and quite distinct from the rest of the subsection combining the exotic look of large leaves and limbs finished in hazy mauve. Native to open hillsides and conifer forests from 10,000 to 13,000 ft. E. Nepal, N India, Bhutan, China 65/330 COR (-5). Form with greyed rose-pink flowers. 76/191 RBG (-5) hongkongense Azaleastrum Shrubs, 5 to 15 ft. Flowers (March) white with violet to red-purple flecks and often fragrant. New growth is typically an amazing purple. Native to Black Mountain in Hong Kong and in the surrounding province of Guangdong, China. Grows on rocky slopes from 1,000 to 4,000 ft. 77/779 ROB.F (+25). White and fragrant flowers hookeri Thomsonia Shrubs or small trees to 14 ft. Flowers (March-April) are deep rose to crimson with darker nectar pouches. Small hook-like barbs along the veins on the underleaf. Found in mixed forests from 8,000 to 12,000 ft. NE India (Arunachal Pradesh) 67/711 ECK-BEN (+10). Pink flowered form. 76/214 RBG (+10) horlickianum Maddenia Shrubs to 10 ft. White to cream flowers (March-April) are flushed pink, have a yellow blotch, and may be fragrant.Tender but unusually free-flowering. Found on rocks, or epiphytic on trees at 4,000 to 7,000 ft. N Burma 84/011 ARD (+32). Flowers are white flushed with pink. 87/053 KW 9403-RBG (+32) 90/069 RBGE:K&P (+32). We have not seen this clone flower yet. hunnewellianum ssp. hunnewellianum Argyrophylla Shrubs to 20 ft. Flowers (March-May) are white to pink with spots. Narrow leaves covered below with a white indumentum. Found on mountain slopes and in thickets at 6,500 to 10,000 ft. China 75/155 FR (0). Form with white flushed pink flowers. 84/150 HLL (0) hyacinthosmum Phaeovireya (Vireya) Shrubs to 10 ft. Flowers (flowering time varies) are white with rose colored spots. 3-1/2" long tubular flowers are scented like hyacinths. Native to tropical rain forest from 6,000 to 7,500 ft. Papua New Guinea 83/064 PS (+32). Flowers white with rose spots. hylaeum Thomsonia Shrubs or small trees to 40 ft. Flowers (May) are fleshy rose-pink with darker spots. Bark is smooth silvery gray- brown to purplish-red. Found in open mixed forests at 8,000 to 12,000 ft. Burma, China 77/743 KW 9322: WGP (+10) hyperythrum Pontica Heat tolerant, vigorous shrubs with compact growth to 5 ft. Flowers (April-May) are white with reddish flecks. Attractive shrubs with dark green leaves. A distinctive species not closely related to other members of the subsection. Native to broad leaved forests at 3,000 to 4,000 ft. Taiwan 69/884 BN (-25). Light pink spotted flowers from deeper buds. Collected in Taiwan. 76/038 PAT: VVN (-25). Light pink spotted flowers from deeper colored buds. Collected in Taiwan. I imberbe Omitted, possibly hybrid of R. barbatum X arboreum. Shrubs to 15 ft. Flowers (March-April) are scarlet or scarlet crimson, sometimes with darker spots and blotched nectar pouches. Included for historical interest. 75/109 WGP (0). impeditum Lapponica Compact shrubs to 3 ft. in height though typically less. Flowers (April) are violet to purple to lavender. Attractive grey-green aromatic leaves. Widespread and common in its native alpine habitat. Very popular with gardeners and many forms are available. Grows on open slopes and forest margins from 10,000 to 15,000 ft. China 73/167 (lysolepis) FR-PHB (-20). Tiny glaucous leaves and bright violet-purple flowers. 76/379 (litangense) WIND:UBC ((10). Dark green foliage and purple flowers 77/617 (litangense). K&P (-20) 84/087 K&P (-20)/ Purple-lavender flowers. 84/088 (litangense) K&P (-10). Purple-lavender flowers. indicum Tsutsusi (Azalea) Dense evergreen shrubs to 6 ft. Flowers (May-June) are pink, salmon-red and white. Popular double and variegated forms, enjoys hot summers and full sun. Native to open rocky ravines and river banks at lower elevations. Japan 77/304 WEB (+20). Form with red-orange flowers, collected in Japan. 81/084 ('Chico Sugata') HLL (+20). Japanese cultivar. inopinum (hybrid of R. wassonii) Unknown in the wild, originally introduced in mixed seed of a Wilson collection, from Sichuan, China. Has been described as a compact shrub to 6 ft. Flowers (April-May) are white to cream with or without a blotch. Included for historical interest. 74/WGP (0). Form with cream flowers. insigne Argyrophylla Bushy shrubs, 5 to 12 ft. Flowers (May) are pale to deep pink with a rose-colored median line along each lobe, sometimes with crimson flecks. Thick, coriaceous leaves with tawny-gray to copper-colored indumentum on the undersurface. Rare in the wild. Found in woodlands from 7,500 to 10,000 ft. China 75/110 WGP (-5). A more rapidly developing form of the species with pink striped flowers. 77/784 Brodick-UBC BG (-5). 79/097 Hobbie (-5) 80/120 HER (-5). Form with light pink flowers. 83/033 HC-CRA-TJ (-5). Form with pink flowers and large foliage. intricatum Lapponica Compact shrubs to 5 ft. Flowers (March-April) are pale lavender to dark blue. Early and unusually shaped flowers make this a distinct species. Very small dark green scaly leaves. Found in open moist meadows and hillsides from 9,000 to 16,000 ft. China 73/144 FR-PHB (-10). A good foliage form with pale lavender flowers. 77/616 K&P (-10). Very small and early flowering, with gray- green foliage and soft lavender-blue blossoms. irroratum ssp. irroratum Irrorata Shrubs to 30 ft. in the wild. Flowers (March-April) are white, pale yellow, pale shrimp-pink to rose, without flecks or with faint to heavy maroon flecking. Tender in colder climates, but sometimes can be grown in a sheltered ares. Found in thickets and forests from 8,000 to 12,000 ft. China 64/222 'Spatter Paint' Rock:CS (+15). Flowers white flushed pink with the inner corolla entirely covered with maroon flecks. 69/073 'Polka Dot' EXB: MVW (+10). An award form. White suffused pink flowers with purple spotting. AM 1957. 84/018 ARD (+5). Form with white flowers. J japonicum Pentanthera (Azalea) Deciduous shrubs, 3 to 10 ft. Flowers (May) are orange-red to scarlet, pink or yellow. A parent of many hybrids, used for vigor and hardiness, Widely distributed in its native habitat on open hillsides and seacliffs, in scrub woodland, bogs, and moorland up to 3,000 ft. Japan. 77/035 MG (-15) 85/008 NA 47185 (-15) 85/011 NA 51322-USNA (-15). Nice red fall color. jasminiflorum Vireya Tropical shrubs to 8 ft. Long tubular flowers (flowering time varies) are white and can be scented. Flowers are in trusses of 5 to 8, there is a pink form in cultivation which may be a hybrid. Native to the Malay Peninsula from 3,800 to 5,000 ft. 78/102 H. Winters-FM (+32). With long tubular scented white flowers. 82/209 Boskoop Res. Sta. (+32) javanicum ssp. brookeanum Euvireya Epiphytic or terrestrial shrubs, 6 to 15 ft. Funnel-shaped flowers (variable flowering time) are orange to orange-pink or red, with a white, cream or golden-yellow center, often fragrant. Found on sandstone and as an epiphyte on mangrove and mossy lowland trees, from sea level to 4,600 ft. Native to Malaysia (Sabah, Sarawak), and Indonesia (W Sumatra, Borneo). 78/089 SA-FM (+32) Soft orange flowers with a salmon-colored throat. johnstoneanum Maddenia Shrubs to 15 ft., occasionally epiphytic. Flowers (May) are white, creamy-white to pale yellow or white flushed pink, with or without a yellow blotch or red spots. Common and widespread in the states of Assam, Manipur, Nagaland, and Mizoram. Found on open slopes and forest margins from 6,000 to 10,000 ft. E India 77/693 ('Double Diamond') BRO (+25). With unusual fully double flowers like a creamy yellow gardenia. 87/030 Childers-J. Sinclair (+20) 90/070 KW#12585:K&P (+25). We have not seen this clone flower yet K kaempferi Tsutsusi (Azalea) Semi-evergreen or deciduous shrubs to 10 ft. Funnel-shaped flowers (May-June) are red to salmon or rose-red, or pink occasionally white, and may have purple or crimson flecks. Strigose leaves are dimorphic with larger, thinner leaves in the spring, and smaller, thicker foliage in the summer. Abundant on exposed slopes from sea level to 3,300 ft. Japan (Hokkaido, Honshu, Shikoku, Kyushu and Yaku). 77/659 ('Eastern Fire') Windsor (-10). An English selection which flowers heavily in pink, toned orange trusses in early May and colors brightly in autumn when the leaves turn yellow and red. An FCC form 79/171 ('Semperflorens') WEB (-10). 81/097 HLL (-10). Small open flowers, white in the throat and reddish pink at the margin. 86/010 HSZ (-10). Double flowered form. kaempferi var. sataense Tsutsusi (Azalea) Semi-evergreen shrubs to 10 ft. Flowers (May) are pink to purple. Usually forms a dense mound. Found on open meadows at 1,500 ft. Japan 77/303 (sataense) WEB (0). Large single pink flowers. kanehirae Tsutsusi (Azalea) Heat tolerant semi-evergreen shrubs to 8 ft. Flowers (April-May) are pink, carmine-red to scarlet. Only recently introduced to western horticulture and still rare in cultivation. Found on river banks of low hilly areas. Taiwan 73/151 USDA 325026 (+10). Red funnel-shaped flowers. kawakamii Pseudovireya (Vireya) Tropical shrubs to 5 ft. Flowers (Summer) are pale yellow or white. Probably the hardiest of the Vireyas and used in hybridizing. Found as an epiphyte in rain forests from 6,000 to 8,500 ft. Taiwan 79/026 HLL: FB: EWS: (+25). Retains its glossy leaves for up to three years. 80/017 PAT-VVN (+25). Form with clusters of soft yellow flowers. Collected in Taiwan. keiskei Triflora Shrubs ranging from 1 to 10 ft., rarely epiphytic. Flowers (April) are lemon to pale yellow. A variable species in size with the compact and prostrate forms being the most popular. Found in hills and rocky places at 2,000 to 6,000 ft. Japan 75/233 ('Yaku Fairy') WEB (-10). Dense prostrate hardy plant under six inches. Well-covered with clear yellow flowers and red-tinged new growth. Makes a excellent groundcover. 76/121 BERG ((10). Compact form with yellow flowers 76/040 WEB (-10)/ Vigorous upright form collected on Yaku Island, Japan, producing a 4-5 foot shrub with light yellow flowers in mid-April. 86/013 ('Red Flare') HSZ (-10) keysii Cinnabarina Tall upright shrubs to 20 ft. Narrow tubular flowers (May-June) are bicolor with yellow lobes tinged orange to salmon pink. Found in forests and dense thickets from 8,000 to 12,000 ft. India, Bhutan, China 64/130 CAE (+10). Form with tubular orange flowers in June. 70/148 (keysii var. unicolor) BRO (+10). Hardy form with red and orange flowers. kiusianum var. kiusianum Tsutsusi (Azalea) Semi-evergreen rounded compact shrubs to 3 ft., usually less. Flowers (May) are purple-mauve, orange-red, carmine, pink or white. Spreading habit makes them ideal for ground cover. Popular for bonsai and container growing. Found in open meadows and forests on mountains above 2,400 up to 5,600 ft. Japan 74/077 FR (-5). Form with white flowers. 77/632 'Benichidori' WEB (-5). Japanese selection with salmon-pink flowers. 79/021 CRH (-5). Form with white flowers. 79/073 'Hanekomachi' USNA (-5). Form with bright pinkish- red flowers. 79/074 'Zuiko' USNA (-5). With light crimson flowers. 79/167 'Hinode' WEB (-5). Clearest red of the numerous selections of this mountain azalea. 79/181 'Mt. Fuji' LOH: UBCP (-5). Pure white form. 81/011 WEB (-5). Warren Berg's best bright pure pink from the seedlings he raised from his own collecting trip to Ebino. 81/100 HLL (-5). A variety with violet flowers. 82/097 'Maiogi' Nitzelius-Goteborg BG (-5) 83/043 'Mountain Gem' WGP (-5). An Award of Merit form. 90/063 WIND ((5). Mauve flowers 90/081 W#11250:RBGE#191029 ((5). kiyosumense Brachycalyx (Azalea) Upright deciduous shrubs to 4 ft. Flowers (April-May) are lilac- purple to reddish purple. Outstanding fall color and may be hardier than originally thought. Japan 77/027 ROK-MG (0). Form with purple flowers. konori Phaeovireya (Vireya) Shrubs or trees, 6 to 20 ft. Flowers are pure white sometimes pinkish. Carnation-like fragrance. Found on the island of New Guinea Native to forest, fern regrowth, burned open summits, peat bogs, swamps, marsh, generally on poor clay soils or humus at 2,500 to 8,200 ft. Indonesia, Papua New Guinea 79/036 PRA (+32). Form with white flowers. 80/143 BOS (+32). Collected wild in the Mt. Saruwaged area in Papua New Guinea. Very fragrant. kyawi Parishia Shrubs or small trees, 15 to 25 ft. Foliage with a reddish brown indumentum. Flowers (June-August) scarlet, rose- scarlet, or crimson. Native to deep wooded gorges, limestone cliffs, thickets and forests from 5,000 to 12,000 ft. in Upper Myanmar and Yunnan, China. 77/745 F#24542:WIND (+15 or +20?) L lacteum Taliensia Shrubs or small trees, 7 to 25 ft. Flowers (April) are pure yellow and sometimes blotched. This famous yellow flowered species, and undoubtedly the most sought after, is extremely difficult to propagate. Native to forest margins and rocky slopes at 12,000 to 13,000 ft. China 64/141 COR (0). Rounded trusses of yellow flowers spotted red. This clone pictured and praised in the 1965 RHS Yearbook. 75/111 Windsor (0). Cream yellow. 75/125 RBG (0). Form with clear yellow flowers. (Grafted) 76/101 G. Van Winkle (0). Pure yellow. laetum Euvireya (Vireya) Tropical upright shrubs to 5 ft. Flowers (flowering time varies) are pure yellow, and can be scented. Often a vigorous grower. Native to the Anggi Lakes area in the Arfak Mountains of Irian Jave on the island of New Guinea. Found in rain forest and in the marshy areas of lakes from 6,000 to 7,500 ft. Indonesia 80/144 BOS (+32). Collected wild on Mt. Arfak, in northwestern Irian Java, Indonesia lanatum Lanata Shrubs to 20 ft; but usually smaller. Flowers (April) are creamy yellow or pink with crimson flecks. Several forms have been found, all with unusual foliage and beautiful indumentum. Native to fir forests and steep scrubby cliffs from 10,000 to 14,000 ft. NE India, Bhutan, China 77/695 (flinckii) BRO (0) 79/176 WEB (0). Wild collected form from Sikkim. lanigerum Arborea Shrubs or small trees to 20 ft. Flowers (February-March) are deep pink to rose-purple. Dark green leaves are shiny above, with white to brown indumentum below. Found on steep ridges at 8,500 to 11,000 ft. China, India 66/556 ('Silva') LOG (+5). An award form with large rounded trusses generously filled with an average of 30 flowers crimson-pink, suffused white in early March. AM 1954 79/113 KW 6258: BH (+5) lapponicum Lapponica Bushy shrubs to 3 ft. Flowers (February) are violet-rose to purple, rarely white. Unique circumpolar distribution. Native to rocky peat over permafrost tundra at 3,000 to 6,000 ft. Scandinavia, USSR (Siberia), N America, Canada, Greenland 78/017 C. Desch (-20) Wild collected form from Mt. Washington, New Hampshire. 78/066 (parvifolium) COX:BERG ((20). Upright form with flowers dark reddish- purple (77A) latoucheae Choniastrum Shrubs or small trees, 6 to 25 ft. Broad, funnel shaped flowers (March-May) are light pink to pale mauve, often with darker flecks, with or without a brown blotch, and may be strongly scented. The stiff foliage is dark green and glossy. Specimens formerly identified as R. wilsonae have been reclassified and merged with this species. Found in densely shaded ravines at 5,000 to 6,000 feet. SE China, Japan (Ryukyu Islands). 65/428 (syn. wilsonae) WAK (0). Delicately scented pastel rose-purple flowers with yellow-brown flecks. laudandum var. temoense Pogonanthum Low shrubs rarely exceeding 2 ft. Flowers (March-April) are white or pink, rarely pale yellow. Found on steep alpine slopes and rocky moraines at 9,500 to 15,000 ft. China 75/036 RBG-K&P (+5). Flowers are a delicate lavender-pink. leiopodum var. amamiense Choniastrum Evergreen shrubs to 10 ft. Flowers pink to white. Grows on rocky hillsides. Taiwan 77/153 WEB (+5) lepidostylum Trichoclada Compact shrubs to 4 ft. Flowers (June) are yellow, sometimes spotted orange. Beautiful glaucous blue, hairy, aromatic leaves. Worth growing for foliage alone. Found on boulders and ledges at 10,000 to 12,000 ft. China 70/044 WW (0). Form with yellow flowers. 75/246 WEB (+5) 76/382 BRO-UBC (0). Form with yellow flowers. lepidotum Lepidota Usually evergreen shrubs to 5 ft. Flowers (April-May) are white, yellow, pink or various shades of purple. Possibly the most widespread and variable of all rhododendron species with a tremendous range of habitat. Found in alpine moorland to various types of forest at 8,000 to 15,000 ft. India, Nepal, Bhutan, NE Burma, China 79/050 ('Reythe's Purple') GLE (0). An award form with bright purple flowers on a plant with low habit. AM 1967 79/054 WEB (0). Yellow flowered form collected on Mt. Everest. 81/009 BB 191: PS (+5) Collected wild at 13,700 ft. near Thimbu, Bhutan. Yellow flowers tinged pink. 82/167 (lepidotum var. album) Hedegaard (+5). White flowers. 82/168 (var. minutiforme) Hedegaard 372 (0). Low growing white lowered form. 84/090 King & Paton (+5). Yellow flowers. leptanthum Phaeovireya (Vireya) Shrubs to 6 ft. Flowers (flowering time varies) are deep pink to salmon or carmine. Found as an epiphyte in high trees or on rocks and dry exposed cliff faces, in jungle openings, and on fallen trunks in forests of Nothofagus from 4,500 to 7,400 ft. Papua New Guinea 85/043 TT-DC (+32) 87/042 BK 75: RBG 671332-RBG (=32) leptothrium Azalestrum Upright shrubs, 2 to 25 ft. Flowers (April) are pale rose or lavender. Suitable for mild gardens with a sheltered site. Found at margins of mixed forests, on cliffs and steam gullies at 4,000 to 11,000 ft. China, N Burma 66/601 CAE (+15). Pale rose-lavender flowers. leucapis Boothia Shrubs to 3 ft. Flowers (March-April) are milky white, often tinged pink. Limited distribution in the wild. Found in cliffs and scrubby slopes, sometimes as an epiphyte at 8,000 to 10,000 ft. China 65/CRA (0). Compact form with white flowers in March. 65/398 CRA (0). Charming white flowers punctuated with dark brown stamens, on a compact low plant. liliiflorum Maddenia Shrubs to 10 ft. Flowers (April-May) are white and fragrant. Only 2-3 flowers per truss, but waxy exquisitely shaped and long lasting. Found on rocky slopes and open ridges from 2,000 to 4,800 ft. China 80/156 UBC PP (+25) lindleyi Maddenii Mostly epiphytic shrubs to 12 ft. Flowers (April) are white, sometimes tinged pink with a yellow blotch and fragrant. Many forms are in cultivation due to the wide distribution in upper temperate rain forests. Usually found in the tops of trees or rarely on rocks hanging over cliffs from 7,000 to 8,500 ft. Nepal, India (W. Bengal, Arunachal Pardesh, Manipur), Bhutan, China 78/067 L&S 6562 - Cox - WEB (+15). The hardy form of this very fragrant large white flowered Himalayan native. lochae Euvireya (Vireya) Tropical shrubs to 6 ft. Flowers (flowering time varies) are scarlet to salmon-red. There are several forms available with flowers in trusses of 2 to 7. Found on mountain tops growing in rock crevices or open bushland at 3,500 to 4,000 ft. Australia. 78/096 DT-FM (+32). Form with pure scarlet flowers. longesquamatum Maculifera Shrubs from 6 to 20 ft. Flowers (May) are rose-pink and blotched. Dense, shaggy hairs on young shoots and leaf petioles. Common over a limited area in wildlands and grassy slopes at 7,500 to 11,000 ft. China 79/149 KEW-GBG (0) longistylum Tephropepela Shrubs to 7 ft. Flowers (April-May) white. Leaves are deep green. Known only from a few collections and material in cultivation. Found on cliffs in central Sichuan at 4,200 to 7,500 ft. China 79/049 GLE (+5). White flowers. loranthiflorum Solenovireya (Vireya) Tropical shrubs to 3 ft. Flowers (variable flowering time) are white. This vireya is easy to grow and loaded with trusses of 5 to 8 salverform flowers. Found as an epiphyte or terrestrial in rain forest from 600 to 3,300 ft. New Britain and Solomon Islands 83/058 PS (+32). White fragrant flowers. lowndesii Lepidota Small, creeping shrubs to 1 ft. Dainty flowers (May-June) are pale yellow and spotted. Highly prized and extremely rare in cultivation. Found in dry rocky ledges or peaty slopes from 12,000 to 15,000 ft. Nepal 82/120 R. Hatch (+15) ludlowii Uniflora Shrubs to 1 ft. Flowers (May) are yellow with reddish-brown spots. Flowers large in comparison to the foliage. Rare and difficult to propagate. Known only from the original collection. Native to rocky hillsides, spreading over moss- covered soil at 13,000 ft. China 74/033 UBC (0). Yellow flowers lukiangense Irrorata Shrubs or small trees, 10 to 20 ft. Flowers (March-April) are deep magenta rose with purple flecks and a basal blotch. Found on open rocky slopes and mixed woodlands from 7,000 to 11,000 ft. China 75/247 (lukiangense ssp. ceraceum) Hiller - WEB (+5) luteiflorum Glauca Compact shrubs, 3 to 5 ft. Campanulate flowers (April) are lemon-yellow to bright clear yellow. Leaves elliptic in shape and aromatic. Rare in the wild. Found above tree-line on exposed ridges at 10,000 to 11,000 ft. NE Burma 64/103 BRO (+10). Early lemon yellow flowers, glaucous undersurface to the leaves. 64/114 LOG (+10). Yellow flowers. 81/124 KW 21040: GLE: ACL: EK (+10). lutescens Triflora Tall growing shrubs up to 20 ft. Flowers (March-April) are pale-yellow with greenish spots. An early blooming pecies. Valuable for its reddish foliage. Found on hillsides and forest slopes at 5,500 to 10,000 ft. China 74/079 ('Bagshot Sands') GLE (+5). An award of Merit form (1953) with clear primrose yellow flowers. 74/080 HYD (-20). Bright yellow flowers. 75/224 CW (+5). An FCC form with yellow flowers. 84/061 BRO (+5). Yellow flowers. luteum Pentanthera (Azalea) Dense, often stoloniferous deciduous shrubs to 12 ft. Flowers (May-June) are yellow and very fragrant. Popular because of the very long flowering season and sweet fragrance. Native to a wide variety of habitats from open grasslands to coniferous woodlands to 4,000 ft. Found in Lithuania, Poland, Belarus, NW Ukraine, E Austria, NE Yugoslavia, Turkey, Georgia, and SW Russia. 74/080 Hydon (-20). Bright yellow flowers. 76/410 AR (-20). Propagated from a selected seedling grown from seed collected wild in Turkey. Fragrant yellow flowers. lyi Maddenia Shrubs to 6 ft. Flowers (April-May) are white with a green or yellowish blotch. Very tender and insists on perfect drainage. From dense woods and dry plateau at 4,000 to 9,000 ft. China 81/125 PGV 19:SA-EK (+25). White fragrant flowers. M macabeanum Grandia Trees to 45 feet. Flowers (march-May) are lemon yellow with a purple blotch in the throat. Large green leaves coated with a thick white or light beige indumentum below. One of the finest of all species. Ranges from 8,000 to 9,500 ft. In dense stands on steep slopes and the summits of hills. NE India 75/180 KW 20304: CS (+15). Yellow flowers with a purple blotch. 75/285 (Tower Court Form) TC: CH (+15). Form with light yellow flowers. macgregoriae Euvireya (Vireya) Tropical shrubs or small trees to 15 ft. Flowers (throughout the year) are yellow to reddish orange or bicolor. Can have up to 20 flowers in a truss. Flowers are long lasting and can be blooming for up to a month. Usually easy to grow. Found in a wide range of habitats in Papua New Guinea. 79/032 Pratt (+32) 85/016 USDA 354381 (+32) 85/026 USDA 354329 (+32). Form with pale apricot flowers. macrogemmum Tsutsusi (Azalea) Medium sized shrubs. Flowers purple. Native to Japan. 77/642 WEB. macrophyllum Pontica Shrubs, 6 to 15 ft. Flowers (May-June) are pink to rose-purple or white, and with or without yellow to red-brown flecks. Found in the province of British Columbia south in the states of Washington, Oregon, and California. For over one hundred years there was considerable confusion over the name of this species. It was called R. californicum by many groups until the efforts of Leonard Frisbie set the record straight. In 1959, this species, with the correct name, was adopted as the Washington State Flower. Native in the deep shade of mixed forests, on the margins of woodland, and on open slopes from sea level to 4,000 ft. W Canada, W USA 77/208 WEB (-5). Form with pure white flowers. 79/019 ('Brookings Deep Pink') BS (-5). Form with deep pink flowers. 79/020 ('Red Langlois') BS (-5). A select deep pink form with very little blue in it. 80/158 P. Miller (-5). White flowered form. 81/008 ('Bill Magness White') BS (-5). A white flowered form. 85/050 ('Seven Devils') BS (-5). Form with flowers white to pink. 85/051 B. Magnus - B. Smith. (-5). White flowered form. 85/053 ('Jim Blackford Form') J. Blackford - B. Smith (-5) macrosepalum Tsutsusi (Azalea) Semi-evergreen shrubs to 6 ft. Flowers (April-May) are pale lavender to pink and sometimes lightly scented. Leaves, hairy and slightly rugose. Native to central and southern Honshu and on Shikoku. Found in thickets and open woods on well-drained soils from 500 to 1,300 feet. Native to central and southern Honshu and on Shikoku. Japan 65/447 'Linearifolium' LEO ((5). Unique ribbon-like leaves and bright lavender- pink flowers, composed of 5 separate ribbon-like petals. Lightly fragrant. This form thought to be a sport of R. macrosepalum. Found in a Japanese garden. 66/447 (syn. linearifolium var. macrosepalum) LEO (+5). Unique ribbon-like leaves and bright lavender-pink flowers, composed of 5 separate ribbon-like petals. 82/118 (Ladylock's) PH (0). A larger growing and larger leaved plant than typical with light purple flowers. 82/134 Moscow Main BG (0). maculiferum ssp. maculiferum Maculifera Shrubs to 20 ft. (but usually less) with a compact habit. Flowers (March-May) are white to pale pink, with a dark crimson blotch. Blooms as a young plant and is relatively hardy. Common in woodlands and on cliffs from 7,000 to 10,000 ft. Native to China (Guizhou, Guangxi, Gansu, Hubei, Shaanxi, and Sichuan). 65/253 STRO ((5 or (10?). Pink buds opening pastel-rose and fading to white, with a magenta blotch. 8-10", maculiferum ssp. anhweiense Maculifera Shrubs from 5 to 8 ft. with a spreading but compact and rounded habit. Distinguished from ssp. maculiferum by its glabrous pedicels, calyx and ovary. Flowers (April-May) are pink to white, with purplish-red spots. Free-blooming, heat tolerant, and relatively hardy, this subspecies should be grown more often in areas such as the eastern coast of the U.S. Native to Lion Ridge, Anhui, China, where it occurs in thickets or on cliffs and open rocky places from 4,000 to 6,000 ft. 65/245 (anhweiense) STRO ((5 or (10?). Rose buds opening to white flushed rose flowers with a light spotting of magenta flecks on the upper lobe. maddenii ssp. crassum Maddenia Shrubs to 6 ft. Flowers (April-May) are white with a yellow blotch and can be scented. Relatively tender but capable of growing again from the base. Found in scrubby thickets from 8,000 to 12,000 ft. India, Burma, China, Vietnam. 65/364 (odoriferum) Brodick (+25). 66/633 (syn. manipurense) LEO (+20). White flowers with a yellow in the base of the throat. 70/183 (crassum) Lamnellen (+10) maddenii ssp. maddenii Maddenia Shrubs to 16 ft. Flowers (May) are white, white suffused pink, rose or purple, cream, occasionally pink, with or without a yellowish or greenish blotch, more rarely yellow, and can be scented. This subspecies found in extreme southern Tibet, Bhutan, Sikkim, and western areas of Arunachal Pradesh. Native to limestone and granite cliffs, ridges and slopes, bamboo thickets, mixed scrub on dry hillsides, and conifer or mixed forests from 5,000 to 12,000 ft. China, Bhutan, India 80/130 (brachysiphon) TRG (+25) makinoi Pontica Shrubs to 8 ft. Flowers (May) are rose to white. Linear-lanceolate leaves with white to light beige indumentum above on new growth and thick tawny indumentum below. Foliage often appears in midsummer which corresponds to the peak annual rainfall in its native habitat on the island of Honshu. Found with ferns and among rocks from 600 to 2,300 ft. Japan 73/173 JHC: PHB (0) 76/047 (makinoi) JHC (-15). 84/152 (makinoi) HLL (-15). Form with pink flowers. mallotum Neriiflora Shrubs or small trees, 5 to 15 ft. Tubular-campanulate flowers (February-April) are scarlet, or cherry-red to crimson. Thick obovate leaves are dark green and rugose above with dense, woolly cinnamon-brown indumentum below. Found in bamboo groves, thickets of other rhododendron species, scrub, and on open rocky slopes and hillsides from 10,.000 to 12,000 ft. NE Burma, China (W Yunnan). 76/150 WGP (+25). This form, received an Award of Merit in 1933 for its crimson flowers and the same award in 1973 for its beautiful foliage. mariesii Brachycalyx Deciduous shrubs, 3 to 20 ft. Flowers (April) rose to rose-purple. Abundant and widespread in the eastern provinces of China and northern Taiwan but extremely rare in cultivation. Found in thickets and on cliffs from 1,200 to 6,300 ft. 76/079 BERG ((5). A clone grown from seed collected in Taiwan. martinianum Selensia Multi-branched shrubs which can reach 7 ft. Flowers (April) are pale yellow to pink with or without purple flecks. Distinctive plants suitable for the small garden. Native to forest margins and open pastures from 10,000 to 14,000 ft. China, NE Upper Burma. 75/205 WA (+5) mauculiferum ssp. anhweiense Maculifera Compact shrubs, 5 top 8 ft. Flowers (April-May) are pink to white with purplish-red spots. Found on open cliffs and shady thickets at 4,000 to 6,000 ft. China 65/245 (anhweiense) STR (-10), Form with light pink flowers. maximum Pontica Shrubs or small trees, 3 to 10 ft. Flowers (July) are white to rose-purple with greenish flecks. A very late flowering species common from the province of Nova Scotia south to the state of Georgia and west into Alabama. Native to deciduous or conifer woodland at 1,000 to 5,500 ft. E Canada, E USA 75/137 'Mt. Mitchell' GAB (-25). This cultivar originating in the mountains of North Carolina. It is distinct in the erratic marbling with red pigment throughout the plant resulting in variably streaked stems and leaves and flowers pink or red, sometimes lighter. 77/564 Schwind - VVN (-25) 80/011 Clarence Towe (-25) Pink flowered form collected wild in S Carolina. 83/192 'Compactum' GLM (-25). Dwarf form with yellow-pink flowers. 89/023 'Red Max' HILL ((25). Especially nice flower and form. 90sd001 Seedlings ( grown from seed collected at Bowman's Hill Wildflower Preserve, Washington Crossing, Pennsylvania. megacalyx Maddenia Shrubs, 4 to 25 ft. possibly less in cultivation. Flowers (May) are white or cream, often flushed purple in bud or, more rarely, flushed a pink-purple when open. A distinctively large calyx, either pale green or green flushed pink, characterizes this species and contributes to its name. Grows in thickets, bamboo, rain forest by streams, often growing out over the water, with scrub, or overhanging sheer granite cliffs, and very rarely epiphytic. Found at 6,000 to 13,000 ft. NE Burma, China, E India 80/134 KW 20836: TRG (+25). Large heavily scented white flowers. megeratum Boothia Bushy shrubs to 3 ft. Flowers (March-April) are creamy to deep yellow sometimes spotted. Sparse and tender, but beautifully shaped flowers are worth protecting. Native to rocks and boulders of cliffs from 10,000 to 13,000 ft. India, NE Burma, China 65/261 BOD (+5). Form with yellow flowers. 73/178 WW: CS (+15) 82/158 JCB (+15) mekongense var. mekongense Trichoclada Usually deciduous shrubs to 6 ft. Flowers (June) are greenish yellow, sometimes flushed red. A variable species with several clones in cultivation. Native to slopes and forest margins at 9,500 to 14,500 ft. Nepal, NE Burma, China 74/111 (viridescens 'Doshong La') GLE (0). An award form with light yellow flowers in late May. AM 1972 76/205 RBG (0). More compact medium growth, lightly glaucous summer foliage and soft tomato red bands along the light yellow flowers. 80/002 ('Yellow Fellow') Borde Hill (0) An Award of Merit form. mekongense var. melinanthum Trichoclada Usually deciduous shrubs to 6 ft. Flowers (June) are greenish yellow to pale yellow. A late flowering variety with a limited distribution in the wild. Found in scrub and on forest margins at 11,000 to 14,000 ft. NE Burma, China 77/714 (melinanthum) RBG (-5). Form with clear yellow flowers. 80/159 (chloranthum) PM (-5) mekongense var. rubrolineatum Trichoclada Usually deciduous shrubs to 6 ft. Flowers (April) are creamy yellow and rose-tinged. Found on forest margins, open pastures and rarely in swamps at 11,000 to 14,000 ft. India, China 76/205 (rubrolineatum) RBG (0). Form with compact medium growth and soft red bands along the light yellow flowers. micranthum Micrantha Shrubs to 6 ft. Flowers (May) are white and very small, to only one-third of an inch long. A free flowering and hardy species with little variation over its wide distribution. Native on grassy slopes, cliffs, and in thickets at 5,000 to 8,500 ft. China, Korea 76/399 PTG (-20) 90sd003 Seedlings ( grown from seed collected in Korea and sent to us by the Korea Botanic Garden microgynum Neriiflora Dwarf shrubs, 2 to 5 ft. Flowers (April) are pale rose to deep crimson, often with deep spots. An easily grown species that blooms at an young age. Found on rocky slopes at forest margins from 12,000 to 14,000 ft. China 68/212 (syn. gymnocarpum) EXB: PHB: JH: MVW (-5). Deep crimson flowers and leathery foliage with a dense indumentum. AM 1940 74/027 (gymnocarpum) F 14242: WGP (-5) micromeres Boothia Epiphytic shrubs to 6 ft. Flowers (May) are pale yellow or white. A tender species very rare in cultivation. Found on mossy trunks in rain forests from 8,000 to 14,000 ft. India, Bhutan, China 77/644 WEB (+25) minus var. chapmanii Caroliniana Heat resistant shrubs to 6 ft. Flowers (April-May) are pink to rose. Native to Florida, growing among sand dunes where it is endangered due to development. Also found in open pine forests and dry creeks near sea level. SE USA 82/187 (chapmanii) NCSU (0). Form with pink flowers, collected in Gulf CO. FL 82/189 (chapmanii) NCSU (0). Wild collected in Clay County, Florida 82/191 (chapmanii) NCSU (0) Wild collected in Gulf Co. FL minus var. minus Caroliniana Shrubs, 3 to 10 ft. Flowers (May-June) mauve to pink to white. Found from the state of South Carolina into Georgia and Alabama. Extremely hardy, especially the former R. carolinianum. Found on mountain slopes and in woods at elevations up to 4,000 ft. SE USA 73/055 (carolinianum)'Epoch') AEK (-25). Form with soft rose-pink flowers. 75/133 (carolinianum "album compactum") GAB ((25). A compact and tight inflorescence ("truss") of beautiful white flushed rose flowers in this famous clone. 82/117 (carolinianum) DELP:RIN ((25). Large flowered form, white flushed rose with magenta flecks. 76/086 CLI (-15). Form with late light rose flowers. 82/116 (carolinianum) GRI (-25) 82/190 NCSU (-25). Wild collected in Oconee CO., SC 83/009 NCSU (-15). Late pink form collected in Jackson Co.,NC molle Pentanthera (Azalea) Deciduous shrubs to 4 ft. Flowers (April-May) are soft golden yellow to orange and may be fragrant. Some forms may be less hardy than others. One of the parents of the famous Mollis hybrids. Native on slopes with pines and in open terrain from 300 to 8,000 ft. China 80/091 R 11316 (USDA 59226): RBG (0). Light orange flowers. 77/035 (japonicum) GRA ((15). Vermillion flowers with gold flecks in this clone. 81/030 (japonicum) USNA#45358:USNA ((15). Orange flowers with darker flecks. Grown from seed collected in Seidagawa, Kusumachi, Fukuoka Prefecture, Japan. mollicomum Scabrifola Shrubs, 1 to 6 ft. Flowers (April) are pale to deep pink. Some forms are rather tender and need winter protection. Found on dryhillsides and forest margins at 10,000 to 12,500 ft. China 76/295 HLS (+10). Pink flowered form. montroseanum Grandia Trees to 50 ft. Flowers (March) are pink with a crimson blotch at the base. Thick and rigid leaves up to two feet long. Limited in the wild. Found in subtropical mixed forests at 8,000 to 9,000 ft. China 74/004 ('Benmore') KW 6261A: RBG (+25). An award form with pink flowers and a crimson blotch. 80/050 KW 6261A BH (+25). From seed collected in Tsangpo Gorge by F. Kingdon Ward on his 1924-25 expedition to Tibet. 82/043 LAM: UBC (+25). From selfed seed collected from the cultivar 'Benmore' morii Maculifera Shrubs or small trees, 15 to 25 ft. Flowers (April-May) are white, usually with a red basal blotch and flecks. A common undergrowth plant in conifer forests from 6,500 to 7,200 ft. Taiwan 77/377 PAT: WWRC (0). From seed collected in Taiwan, a selection with lively pink flowers. 79/114 W 10955: BH (0). White flowers with a red blotch. moulmainense Choniastrum Shrubs or small trees, 5 to 50 ft. Fragrant, tubular funnel-shaped flowers (March-April) are white, white flushed yellow or pink, pink, magenta or lilac, with or without a yellow or pale green blotch. The coriaceous leaves, elliptic to narrowly elliptic, are bright green or olive-green and glossy. Found on open hillsides in forests and thickets from 1,300 to 12,000 ft. Widespread distribution in the wild: S China, (SE Tibet to Guangdong), Taiwan, Laos, Vietnam, Cambodia W Malaysia. 80/098 (syn. westlandii) RBG (+20). Lavender flowers, light fragrance. moupinense Moupinensia Shrubs to 5 ft. Flowers (February-March) are white, often flushed pink, usually with dark red spots. One of the first rhododendrons to flower. Flowers are fairly frost resistant. Limited in the wild. Found among rocks, on cliffs, and sometimes as a epiphyte at 6,500 to 13,000 ft. China 69/109 JHC-MVW (0). White flowers flushed rose on the lobes and with deep red flecks. 74/083 GLE (0). White flowers flushed rose on the lobes with deep red flecks. 79/131 EHW 879: GLE (0). White flowers. mucronulatum Rhodorastra Sprawling shrubs to 8 ft. Flowers (February-March) are red-purple, pink to rose, or white. Welcome for the midwinter blooms. Hardy deciduous rhododendrons with many popular dwarf forms. Native to dry stony slopes and forest margins from 1,000 to 5,000 ft. E USSR, Mongolia, China, Korea, Japan 73/193 'Cornell Pink' TIC-PHB (-15). An award form with very early soft pink flowers and yellow orange autumn color. AM 1965 76/127 WEB (-15). Dwarf form collected on Cheju Island, Korea with bright lavender-rose flowers. 76/408 WEB (-15) 77/661 'Winter Brightness' WGP (-15). Deep red-purple flowers. 79/168 (89/011) 'Crater's Edge' WEB (-15). Collected on the heights of Cheju Island, Korea. Very dwarf form with red-lavender flowers. 81/020 'Mahogany Red' Wada - A. Kehr (-15). Typical upright shrub form but with subdued watermelon red flowers. 85/060 NA 55065-USNA (-15). From wild collections in Korea on sunny hillsides. myrtifolium Rhodendron Dwarf shrubs seldom exceeding 2 ft. Flowers (May-June) are pink or rarely white. A compact native of the Carpathian and Balkan mountains in Hungry, Bulgaria, eastern Yugoslavia, Romania and the Ukraine. Found mixed with pine scrub, on moorlands, and occasionally on limestone from 5,000 to 7,500 ft. E Europe 73/159 (kotschyi) WW (-5) 82/135 Bremen Rhod. Park (-5). A white flowered form of this dwarf species collected in Bulgaria. N nakaharae Tsutsusi (Azalea) Prostrate shrubs to 1.5 ft. Flowers (June-July) are brick to rose-red. Hardy and welcome for its flowers in early summer. Useful as a ground cover and popular with hybridizers. Found in open grasslands and on sandstone rocks at 1,000 to 3,300 ft. Taiwan 73/195 GIG (-5). Pink-red flowers. 74/085 'Mariko' Hydon (-5). Very prostrate Japanese selection with pink-red flowers in June. An award form. 75/267 'Mt. Seven Star' PH (-5). A distinctively better form of this species with a denser habit and larger deep red flowers. neriiflorum ssp. neriiflorum Neriiflora Shrubs or small trees, 3 to 20 ft. Flowers (March-April) are scarlet to crimson or bright red. Dark green leaves often glabrous below. Found in pine forests, open meadows and among scrub at 9,000 to 11,000 ft. China 74/025 'Rosevallon' CAE-FR (0). There is still debate whether this is a true species or not, although some growers say it does come true from seed. Bright red flowers and a striking purplish-red underleaf. 83/110 ADM (+10) nipponicum Viscidula (Azalea) Upright deciduous shrubs to 6 ft. Flowers (June) are greenish-white with spots. Brilliant autumn color and reddish- brown peeling bark. Native to deciduous forests and hillsides from 3,000 to 4,500 ft. Japan 73/197 UBC (0) 76/048 JHC (0) nitidulum var. nitidulum Lapponica Upright shrubs to 4 ft. Flowers (April) are rosy-lilac to violet purple. A dainty shrub with small leaves and 1-2 flowers per truss. Found in alpine moorland from 10,000 to 16,000 ft. China 84/114 Glendoick (0). nitidulum var. omeiense Lapponica Dwarf shrubs to 4 ft. Flowers (April) are rose-lilac to violet-purple. This variety found only near the summit of Mt. Omei in central Sichuan province. Grows on rocky slopes from 10,000 to 11,500 ft. China 84/114 GLE (0) nivale ssp. boreale Lapponica Low compact shrubs rarely over 3 ft. Flowers (April) are bright mauve to pale purple. Frequently collected with many forms in cultivation. Found on open rocky slopes and swampy alpine grasslands from 10,000 to 16,000 ft. China 66/576 (syn. stictophyllum) Wisely (-5). Small funnel shaped mauve flowers. 76/300 (syn. violaceum) REU-VVN (-5). Form with purple flowers. 79/141 (syn. stictophyllum) RBG (-5). Form with olive green leaves and lavender flowers. 81/149 RBG (0) nivale ssp. nivale Lapponica Low, compact shrubs rarely attaining 3 ft. Flowers (April) are rich purple to magenta to lilac. Comes from the highest altitudes of all rhododendrons. Native to open mountainsides and screes 10,000 to 19,000 ft. Nepal, India, Bhutan, China 65/457 (syn. paludosum) WIS (-5). Form with purple-magenta flowers and a more upright habit. niveum Arbora Shrubs or trees to 20 ft. Flowers (April-May) are deep magenta to deep lilac. Leaves with a buff-colored indumenmtum. A distinctive and noble species, rare in the wild. Found in mixed forests and rocky slopes from 9,500 to 12,000 ft. NE India, Bhutan. 65/345 STO (+10). Dense trusses of lavender-purple. 74/013 MBL (+10). Propagated from a selected seedling grown from seed collected in Nepal. 75/115 WGB (+10). Purple flowers. 76/201 RBG (+10) 77/525 BERG (+10). "Kool-aid" purple flowers in this clone grown from seed collected in Sikkim. noriakianum Tsutsusi (Azalea) Low shrubs to 3 ft. Flowers (May) are pale to deep purple or red. A semi-deciduous rhododendron with an open growth habit. Found in open forests and grasslands from 6,500 to 10,000 ft. Taiwan 78/036 HLL: UBCP (+10). Propagated from a selected seedling grown from seed collected at Chi-Li-Ting, Taiwan.Lavender flowers. O oblongifolium Pentanthera (Azalea) Broad shrubs to 6 ft. Flowers (June) are white to pink and very fragrant. Most forms are not completely hardy in northern gardens. Found in sandy streamsides and moist slopes of plateaus at low elevations. SE to Central N. America 76/280 Lynn Lowrie-"USNA (+10). Small white flowers and light weight foliage, orange-red in fall. Wild collected in Texas. obtusum Tsutsusi (Azalea) R. obtusum is no longer considered a valid name.Its forms are believed to be cultivated varieties of R. kaempferi and R. kiusianum or natural hybrids between these two species. Upright dense shrubs, 6 to 8 ft. Flowers (April) are vivid purplish-red. A vigorous grower and popular for bonsai. A natural or garden hybrid associated with the Kurume Azalea hybrids. The wild species Azalea obtusa introduced by Fortune in 1844 is probably lost to commerce. 74/087 'Amoenum' HOI (0). Dense shrubs, spreading to 8 feet or more. Vivid magenta flowers. A taller form with 'hose in hose flowers. 78/106 FRY: LJ (0). Deep rose flowers. occidentale Pentanthera (Azalea) Deciduous shrubs to 15 ft. Fragrant flowers (May-June) are commonly white with a strong yellow flare, but may be pink, red, yellow, orange-pink, or white tinged pink or red, and may have a yellow, yellow-orange to orange-maroon, or maroon flare. Many selected clones available showing the wide diversity of flower color and shape. Red to coppery autumn color. Tolerates a variety of habitat from moist edges of swamps to steep hillsides up to 9,000 ft. California, Oregon. 74/090 SM 604: FM (-10)/ Pink flowers 76/049 'Leonard Frisbie' SM 232: BS (-10). Very large fragrant frilled flowers, white suffused pink with a yellow blotch. 77/379 SM 501: FM (-10). 77/382 SM 56: FM (-10). 77/383 'Stagecoach Cream' FM (-10). Flowers creamy white with large orange-yellow upper petals. Propagated originally from a plant found in Humboldt County, California. 77/385 SM 408: FM (-10). Deep pink flowers with an orange flare. Propagated from a plant found in Del Norte, Calif. 77/388 SM 502: FM (-10). Form with broad wine-red margination of all petals on a white background. Wild collected in Humboldt Co., CA. 77/389 'Pistil Packin Mama' Howard Slonecker - FM (-10). Though the name is facetious, these plants are all business. The flowers are reduced to only the pistil with a small socket at its base; a curiosity found in an island stand of the Western azalea near Myrtle Creek, Oregon. 89/020 SM 28-2: FM (-10). Hose-in-hose corolla. 81/116 SM#245:SMI.B ((10). 77/388 SM#502:MOSS ((10). Flowers late with some red and/or picotee in this clone collected in Humboldt County, oldhamii Tsutsusi (Azalea) Broad shrubs, 4 to 10 ft. Flowers (May) are salmon to brick red with darker spots. Marginally hardy in most colder climates. Elliptic to oval leaves, slightly rugose, and with dense hairs. Found on grassy fields and sandstone cliffs from sea-level to 9,000 ft. Taiwan 73/203 USDA 325036-USDA (+10). Stems and leaves covered with soft hairs, flowers bright brick-red. orbiculare ssp. orbiculare Fortunea Shrubs or small trees up to 10 ft. Flowers (April-May) are pink to rose without flecks. A highly desirable and distinctive species, with no close allies, combines rounded leaves, dome- shaped habit and bell like flowers. Grows in evergreen forest and rocky thickets from 8,000 to 13,000 ft. China 65/350 CAE (-5). Clear pink flowers. 66/542 RBG (-5). Spherical buds opening to rose-pink bells. 67/702 BOD (-5). An award form with rose pink flowers. AM 1922 orbiculatum Solenovireya (Vireya) Shrubs or small trees to 10 ft. Flowers (January-December) are white or pale pink and scented. Epiphytic in ridge forests or terrestrial in low scrubby vegetation on bare sandstone rocks or in elfin woodland on rugged hill crests at 2,600 to 5,700 ft. Borneo, Brunei 83/070 PS (+32). Flowers are white with pink. oreodoxa var. fargesii Fortunea Shrubs or small trees, 7 to 17 ft. Flowers (March-April) are lilac-pink to deep pink and heavily speckled. A widespread variety found in forests and woodlands from 8,500 to 13,500 ft. China 62/046 (erubescens) RBG: MVW (-5). Form with early March delicate pink flowers, almost red in bud. 65/308 (fargesii) CRA (-5). Form with rose-pink flowers. 75/316 (erubescens) CHP (-5). Form with pink flowers. 83/155 (fargesii) WGP (-5) oreodoxa var. oreodoxa Fortunea Shrubs or small trees, 7 to 17 ft. Flowers (March) are pale rose to deep pink with or without flecks. A hardy species native to woodlands and forests at 8,500 to 13,500 ft. China 77/749 WGP (-5) 80/121 HER (-5). Flowers pale pink with profuse darker flecks on the upper lobe. 82/152 AO-FBG (-10). Form with deep pink flowers. oreotrephes Triflora Shrubs or small trees, 3 to 25 ft. Flowers (April-May) are pink to rose or rose-lavender, rarely white. Usually hardy with beautiful glaucous leaves and a neat habit in many forms. Common and widespread in the wild in open thickets and scrubby rocky slopes at 9,000 to 14,000 ft. China 66/625 F#20489:WIND (0). Flowers white flushed rose-purple with green-gold flecks 70/054 ES (0). Form with rose-lavender flowers. 73/211 (exquisitum) EXB:ROBB (0). Flowers pastel rose-purple. 75/296 Barto - CHP (0). 76/335 CHP (0). Form with white flowers. 77/776 CRA (0). Form with white flowers. 80/122 HER (0). Form with very good glaucous new growth. 87/005 RCH (0). Form with white flowers. orthocladum var. microleucum Lapponica Compact mounding shrubs to 2 ft. Flowers (April-May) are pure white. Known only in cultivation as a white variety. (No known wild population) 77/216 (microleucum) JHC (-5). Dwarf mounding plant with dark green leaves and white flowers in April. orthocladum var. orthocladum Lapponica Bushy upright shrubs to 4 ft. Flowers (April) are pale to deep lavender-blue to purple. This species given the epithet 'with straight twigs' by George Forrest who introduced it into cultivation in 1913. Found in alpine meadows, on ledges of limestone cliffs, and pine forest margins from 8,000 to 14,000 ft. China 75/273 UW - DG (0) 83/141 F 20493: RBG 712537-RBG (0) ovatum Azaleastrum Bushy shrubs, 3 to 12 ft. Flowers (April) are pure white, pink to purple or lavender with pink or deep crimson spots. Those specimens formerly identified as R. Bachii have been reclassified and merged with R. ovatum. Found on forest margins, in dense thickets, and on open slopes from 1.500 to 6,500 ft. Native from the Chinese province of Anhui southward to Guangdong and west into Sichuan and on the central mountain range of Taiwan. 76/050 Gable - VVN (-5). Light pink 1" saucers for flowers. 79/157 (syn. bachii) UCB (+15). Light lavender flowers. 81/146 BOD (-5). White flowers. 82/012 W 1391: PRT (0). achypodum Maddenia Shrubs, 4 to 25 ft. Flowers (March-April) are white with a yellow blotch. A variable species with forms that are marginally hardy and occasionally fragrant. Found on dry slopes, cliffs, occasionally as a epiphyte from 6,000 to 12,000 ft. China 87/055 F.007516 - RBG (+25) P pachysanthum Maculifera Shrubs to 4 ft. in the wild. Flowers (April) are white to pale pink with purple flecks. One of the finest foliage plants of the genius, it is a compact grower under the right conditions. Found on exposed ridges at or above 10,000 ft. Taiwan 78/064 Patrick - WEB (0) 91/039 BERG (0). Selected seedling grown from Cox seed. pachytrichum Maculifera Shrubs or small trees to 20 ft. Flowers (March-April) are white suffused pink, with a purple basal blotch and flecks. Found in woods and open slopes at 8,000 to 11,500 ft. China 70/191 W#1435:LAM ((5). Pastel-rose flowers with a burgundy blotch. 65/389 'Sesame' BOD:UBCP ((5). Flowers rose in bud opening to white flushed pink in this AM form (1963). 76/164 BOD (-5). Form with pink flowers. 78/064 PAT-WEB (-5) parmulatum Neriiflora Dwarf shrubs, 2 to 4 ft. Flowers (March-April) are white or pale yellow with red flecks. Unusual colored and spotted flowers distinguish this member of a variable group. Found on steep cliffs in areas of high rainfall at 10,000 to 12,000 ft. China 82/047 ('Ocelot') TRE: UBC (0). An Award of Merit form, 1977. 74/017 ROBB (0) pauciflorum Euvireya (Vireya) Low tropical shrubs to 3 ft. Flowers (flowering time varies) are rose to bright red. Only 1 or 2 flowers per truss, but a fairly reliable bloomer. Native to the Malay Peninsula and found in rain forests, sometimes as an epiphyte at 4,500 to 7,000 ft. Malaysia 83/067 PS (+32) pemakoense Uniflora Low mounding shrubs to 2 ft; often stoloniferous. Large delicate flowers (March-April) are pale pink-purple to pink to mauve. A very early and free flowering dwarf, particularly effective when planted in drifts. Found on cliffs and ledges at 9,500 to 11,000 ft. India, China 70/042 FR (0). Form with soft lavender-rose flowers. pendulum Edgeworthia Straggling epiphytic shrubs to 4 ft. Flowers (April-May) are white, white flushed pink on cream. Hairy leaves. Difficult to grow well, but interesting for the collector. Found in dense forests at 7,5000 to 12,000 ft. Nepal, India, Bhutan, China 76/141 LS&T 6660: RBG (+10). Form with white flowers. peregrinum Omitted, possible hybrid of R. galactinum. Shrubs or small trees up to 10 ft. Flowers (March-April) are cherry-scarlet to deep rose crimson. Only known in cultivation. Included for historical interest. 65/316 LAM (0). Flowers are white with bright red blotches. periclymenoides Pentanthera (Azalea) (syn. nudiflorum) Deciduous well-branched shrubs to 8 ft. Flowers (April-May) are pale to deep pink or white with dark purple tubes. Very hardy and the best forms are sweetly fragrant like honeysuckle. Found on damp stream banks and dry, rocky wooded slopes up to 4,000 ft. in elevation. E USA 76/292 KWG (-25). Collected by Ken Gambrill in Howard County, Maryland. Flowers shaded from rose-pink flaring petals to maroon-pink corolla tube. 76/293 'Doughoregan' KWG (-25). Wild collected in Howard County, Maryland. More uniformly pure pink flowers appearing several weeks later than average, and with a lower growing habit of under three feet. 80/013 CT (-25). Wild collected in South Carolina. 82/023 NN (-25). Wild collected near Branford, Connecticut. 90sd004 (nudiflorum) Seedlings ( grown from seed collected at Bowman's Hill Wildflower Preserve, Washington Crossing, Pennsylvania. phaeochitum Phaeovireya (Vireya) Epiphytic shrubs to 3 ft. Flowers (April-December) are pink to deep red. Found as an epiphyte or sometimes terrestrial on ridges at 7,000 to 8,400 ft. Papua New Guinea 78/100 DS: FM (+32) phaeochrysum var. agglutinatum Taliensia Usually compact shrubs, 3 to 12 ft. Flowers (March-April) are white to creamy-white or pale rose. Very common and widespread among open forests and stony pastures from 11,000 to 12,000 ft. China 77/653 (syn. agglutinatum) R 11335: WGP (0). White flowers. 80/070 (syn. agglutinatum) LS&E 15763: CH (0). phaeochrysum var. phaeochrysum Taliensia Shrubs, 3 to 15 ft. Flowers (March-April) are white flushed pink with crimson flecks. Hardy, attractive foliage plants which bloom freely upon maturity. Found in open forests and stony pastures from 11,000 to 15,000 ft. China 71/509 (dryophyllum) F.29327 - Windsor - UBC PP (0) 75/203 HIL-WA (0). Flowers white flushed pink. 79/139 RBG (0). Form with white flowers. phaeopeplum Phaeovireya (Vireya) Upright tropical shrubs. Flowers (flowering time varies) are pale pink with darker lobes and scented. Very dark and numerous scales and soft new growth on a plant popular with hybridizers. Native to Papua New Guinea at around 4,000 ft. 83/065 PS (+32). Pale pink scented flowers. pianensis (Unclassified) 79/088 AEK (+10). Collected in the wild on the island of Taiwan. piercei Neriiflora Shrubs, 5 to 8 ft. Flowers (April) are crimson with darker nectar pouches. Dark green leaves, ovate to elliptic, slightly rugolose above, and with a thick brown indumentum below. Named for Mr. & Mrs. Lawrence J. Pierce of Seattle Washington. Known only from one collection, by F. Kingdon Ward and found in a limited area of high rain fall at 12,000 to 13,000 ft. China (SE Tibet) 76/210 RBG (+5). Open trusses of pure scarlet flowers pictured on the cover of ARS Bulletin Fall 1976. pingianum Argyrophylla Shrubs or small trees, 12 to 25 ft. Flowers (April-May) are pink to pale purple. Limited distribution in the wild. Found in forests and on mountain slopes from 6,500 to 9,000 ft. China 79/161 Hu 8199: UW 803-47-UWA (+10) pleistanthum Triflora Shrubs, 2 to 15 ft. Flowers (April) are white, or white flushed with pink or lilac often with spots of yellow or red. A geographically distinct species not common in cultivation. Found at forest margins and mixed thickets at 6,000 to 14,000 ft. China 80/094 RBG (+10). Flowers white flushed pink. pocophorum var. Pocophorum Neriiflora Shrubs, 2 to 10 ft. Flowers (March-April) are light to deep crimson. Thick leathery leaves are covered below with a heavy indumentum. Found in thickets and open rocky slopes at 12,000 to 15,000 ft. NE India, China 75/055 KW 8289: NYM (+5). Early April flowers are deep red and fleshy. polycladum Lapponica Upright dwarf shrubs to 4 ft. Flowers (April) are lavender to rich purple-blue. Among the nearest to true blue of all rhododendrons. Free flowering and very popular. Found at forest margins and cliffs at 10,000 to 14,000 ft. China 73/252 (syn. scintillans) FR-PHB (-10). Form with lavender flowers. 73/253 (syn. scintillans) ACL (-10). Form lavender flowers. polylepis Triflora Shrubs or small trees, 3 to 20 ft. Flowers (April-May) are purple or rosy-mauve. Found in woods and thickets from 6,500 to 10,000 ft. China 75/216 PTG (0) ponticum Pontica Dense shrubs from 6 to 20 ft. Flowers (May-June) are lilac-pink to purple. A species with an interesting distribution and many forms. Found from sea-level to 6,000 ft. in mixed forests and thickest in wooded valleys. Spain, Portugal, SE Bulgaria, N Turkey, SW Russia, Georgia,Lebanon. 78/056 'cheiranthifolium' CHP (0). Unusual form with typical light purple flowers but long narrow leaves with irregular undulating margins. 79/001 'Variegatum' VMP: SKI (0). Dark green leaves with variegated leaf edges on this form with lavender flowers. 79/130 AC&H: GLE (0). Form with pale pink flowers. praeteritum Fortunea Shrubs to 12 ft. Flowers (March-April) white flushed pink to pale pink, with purple flecks. An aberrant member of subsection Fortunea, possibly a hybrid of R. oreodoxa. Original collection by Wilson in China 75/075 WAK (-5). Form with light p[ink flowers. praetervisum Euvireya (Vireya) Tropical shrubs to 6 ft. Flowers (variable flowering time) are pink to violet, very long and trumpet-shaped with three to seven very lax trusses. These flowers are pollinated in the wild by birds, called Whitehead's Spiderhunters, with long curved beaks. Found on the island of Borneo and native to rain forest from 3,600 to 6,000 ft. Indonesia, Malaysia 87/045 RBG 792882: CLL (+32) praevernum Fortunea Shrubs to 12 ft. Flowers (March) are white, sometimes pinkish, with a large deep purple blotch. E.H. Wilson discovered this species in 1900. Native to forests at 5,000 to 8,000 ft. China 82/008 BRO: LB (-10). Flowers pink with a purple blotch. primuliflorum Pogonanthum Upright shrubs to 6 ft. Flowers (April-May) are white, greenish white or pale rose. Very distinctive "primula-like" flowers with a short corolla which take a few years to appear. Found in scrub and meadows at the margins of forests from 11,000 to 15,000 ft. China 77/603 (primuliflorum var. cephalanthoides) Glendoick - WEB (0) 77/715 RBG (0). Form with pink flowers. principis Taliensia Shrubs to 15 ft. Flowers (March-April are white to pink with purple flecks. A very hardy species, more free flowering than its relatives. Found among deciduous open forests from 9,500 to 13,000 ft. China 65/282 (vellereum) BH (0). Form with light pink flowers in April and dense thick light butter colored indumentum. prinophyllum Pentanthera (Azalea) Deciduous shrubs to 15 ft. Flowers (May) are pale to deep pink, rarely white and with a spicy fragrance like cloves. Native from the state of Missouri east to Virginia and northwards into the province of Quebec. Grows from the edges of sphagnum bogs to mountain thickets up to 5,500 ft. E Canada, E USA 78/032 (roseum 'Marie Hoffman') GLM (-25). Very fragrant. Larger flowers than typical and possibly a natural hybrid. 80/026 (roseum) AA (-25). Pink flowers. pronum Taliensia Dwarf mounding shrubs which can reach 2 ft. Flowers (April) are white or pale yellow with purple flecks. Very slow growing and compact. This distinct species has always been very rare in cultivation and reluctant to flower. Found in open rocky pastures 12,000 to 14,000 ft. China 74/041 GF 26: WGP (-5). Attractive blue-green leaves. 74/047 WEB (-5). Attractive blue-green leaves. pruniflorum Glauca Shrubs to 3 ft. Flowers (May) are dusky violet, crimson to plum-purple. Found in sheltered rhododendron thickets, forests and on hillsides at 10,000 to 13,000 ft. Burma, India 66/676 (tsangpoense var. pruniflorum) WW (0). Form with dusky purple flowers. 74/024 ('Hohman') USNA (-5) Selected orange-red form. 76/281 HTS 1111K - USNA (-5). Wild collected in Henery Co., AL 80/138 (tsangpoense var. pruniflorum) TRG (0). Form with lavender flowers. prunifolium Pentanthera (Azalea) Deciduous shrubs to 15 ft. or more. Flowers (July-August) are red-orange to vivid red or scarlet, occasionally light orange or yellow. Very late flowering and takes more shade than most deciduous azaleas. Extremely variable in flower color, even on the same plant and from year to year. Rare in the wild, native to moist ravines and pine forests in a very restricted area of low elevation. SE USA 74/024 'Hohman' USNA (-5). Selected orange-red form. 76/281 HTS 1111K: NA 13190-USNA (-5). Wild collected in Henry County, Alabama. pseudochrysanthum Maculifera Often low shrubs which can reach up to 10 ft. Flowers (April) are pink with crimson flecks. A superb species with very dwarf and slow growing forms the most popular. Admired for its compact habit and stiff upturned leaves. Covers large areas of gravelly slopes, often above the tree line from 6,000 to 13,000 ft. Taiwan 73/410 USDA 325054 (-5). Dwarf compact plant with white flowers and small leaves reddish on the undersurface. 75/076 W#10928:WAK ((5). Flowers white, slightly flushed rose with magenta spots on upper lobe. 75/189 CS (-5). An Award of Merit form. Dwarf flowers pink with a crimson fleck. AM pubescens Scabrifolia Shrubs to 4 ft. Foliage very narrow and hairy. Flowers (March-April) rose-pink. Native to N Yunnan and SW Sichuan, China in open rocky places and scrub from 9,500 to 10,000 ft. Formerly a synonym of R. spiciferum. 70/114 'Fine Bristles' KW#3953:WIND ((5). Flowers white flushed rose in this 1955 AM form. Q quinquefolium Sciadorhodion (Azalea) Deciduous shrubs to 15 ft. Flowers (May) are white with greenish spots or blotch. Leaves in whorls of five, often with red-purple margins. Found in open woodlands, forming thickets at 3,500 ft. Japan IJ-027 Seedling of [73/234 ('Five Arrows') EXB (-5)]. R racemosum Scabrifolioa Shrubs from 1 to 10 ft. Flowers (April) are white to pale or deep pink. A variable species in height and hardiness with many desirable forms in cultivation. Found on rocky hillsides, mountain meadows, and in thickets ard forests from 9,000 to 14,000 ft. China 77/677 CRA (-5). A compact form collected by Reginald J. Farrer. 79/009 R 11403 (USDA 59717): PS (-5). Light pink flowers along red stems on this upright selection. 79/180 'Rock Rose' R 11265 (USDA 59578) ('Rock Rose') NYM: UBCP (-5). Flowers rose-pink. AM 1970. ramsdenianum Irrorata Shrubs or trees to 40 ft. Flowers (April) are scarlet to deep crimson. Grows in a wet subtropical habitat. Limited in the wild where it is found in mixed forests at 7,000 to 9,000 ft. China LAM (+10). Form with deep rose flowers. rarum Phaeovireya (Vireya) Epiphytic slender shrubs to 4 ft. Flowers (April-November) are deep pink, crimson to scarlet or blood red. Common over local area. Found on tree trunks or rotten stumps in mountain forest, also in light/ moss-forest at 5,200 to 11,000 ft. 85/001 EWS (+32). Form with deep rose-pink flowers. recurvoides Glischra Dwarf shrubs, 3 to 5 ft. Flowers (April-May) are white flushed pink or rose with crimson spots. A highly prized, compact, and slow grower with superb foliage. Narrow dark green leaves are covered below with dense yellow to mustard indumentum. Found on steep slopes of scree and among boulders on steep slopes at 11,000 ft. NE Burma 74/098 KW 7184: GRE: UBC (-10). Form with bold pink flowers in early April and dark yellow indumentum. 74/099 HIL (-10). Form with rose-pink flowers and mustard- colored indumentum. 75/056 KW 7184: NYM (-10). Form with shorter leaves and less dense indumentum than typical, but a denser shrub with large pink to white flowers. retusum Pseudovireya (Vireya) Small trees up to 13 ft. Flowers (flowering time varies) are red, orange-red to intense scarlet. Trusses of 4-10 one inch long flowers. Native to Sumatra and Java from 4,500 to 11,000 ft. 79/027 EWS (+32)/ Form with five pure red funnel-shaped flowers per truss. rex ssp. arizelum Falconera Large shrubs or small trees, 10 to 25 ft. Flowers (March-April) are cream to yellow, flushed rose, apricot, deep rose with crimson basal blotch. Leaves with thick rust to cinnamon or fawn colored indumentum. Native to open conifer forests and thickets from 10,000 to 14,000 ft. China, NE Burma 65/335 (arizelum 'Brodick') BRO (+10). Compact trusses of purple-pink flowers with a contrasting dark red blotch. An Award of Merit form, 1963. 82/031 (arixelum) Forrest 21861: WER-UBC (+15). rex ssp. fictolacteum Falconera Large shrubs or small trees to 40 ft. under ideal conditions. Flowers (April) are white through blush-pink, pale lilac to rose, often heavily spotted and blotched. Large glossy green indumented leaves. One of the best larger species suitable for cooler areas. Native to conifer forests and thickets from 10,000 to 14,000 ft. China, NE Burma 75/158 (syn. fictolacteum) R 84: FR (-5). Hardy form with white flowers. rex ssp. rex Falconera Large shrubs or small trees, 10 to 45 ft. Flowers (April) are white, pale lilac or pink to mauve with crimson blotch and spots. Large glossy green leaves with silver to bronze indumentum below. Very common in conifer forests at or just above 10,000 ft. in SW Sichuan. China 75/118 R.18234(03800) - Windsor (0). An Award of Merit form, 1955. 76/181 RBG (-5) rigidum Triflora Shrubs, 3 to 30 ft. Flowers (April-May) are white to rose pink to lilac and may be spotted. Very floriferous. The name is descriptive of both habit and foliage. Commonly found in scrub and forested slopes from 6,500 to 11,000 ft. China 69/742 DJ-WW (+5). Form with numerous pure white flowers. HI073 Seedlings ( grown from seed collected in Yunnan and sent to us by the Nanjing Botanical Garden. rirei Argyrophylla Small trees, 10 to 40 ft. Flowers (February-March) are purplish-mauve to pale violet. A distinct species with very limited distribution in the wild. Found on open rocky slopes from 4,000 to 7,200 ft. China 65/454 Leonardslee (+10). Trusses of light purple flowers before the end of winter. 75/013 HIL (0). Form with soft purple flowers. 84/022 (+10). Lavender flowers. 'Rosevallon' (possible hybrid of R. neriiflorum) included for historical interest. 74/025 Caerhays - FR (0). Plant originating at Caerhays with bright red flowers, plant habit and leaf shape of R. neriiflorum, but a striking purplish-red underleaf rather than glaucous. Selfed seed has reproduces this character. rothschildii Falconera Shrubs or small trees 10 to 20 ft. Flowers (March-April) are pale yellow with a purple blotch. Limited distribution in the wild. Found in mixed forests at 12,000 to 13,000 ft. China 75/182 Rock 157:CS (+5) roxieanum var. roxieanum Taliensia Shrubs, sometimes dwarf, from one-half to 13 ft. Flowers (April) are funnel-campanulate, cream-white,white, white flushed pink, or rarely pale yellow, with or without crimson or purple flecks. Dark green leaves, linear to narrowly elliptic, with a thick wooly indumentum below. Highly ornamental plants attractive year round. Narrow leaf forms are especially prized and sought after. Native to pine forests, alpine meadows, and stony slopes from 10,000 to 14,000 ft. China 74/116 GRE - UBC (0). A non-narrow leaf form with flowers white to pale yellow and crimson flecks. 74/117 Hillier - PHB (0). A narrow leaved form of R. roxieanum with an upright habit. 92/098 BRA:BERG (0). Wide leaf form. 92/101 (roxieanum var. oreonastes) BERG (0). Narrow leaf form. rubiginosum Heliolepida Shrubs or small trees to 30 ft. Flowers (March-April) are pink to mauve, lavender, or rarely white and with purple, or brown to crimson flecks. Attractive and vigorous ornamental plants for the garden. Dark brown or rust-colored scales on the leaf undersurface. Widely distributed and variable with some less hardy forms. Grows in oak, spruce, and pine forests, among thickets, and on open slopes at 8,000 to 11,500 ft. China. 66/627 YU 14990: WGP (0). Rose-lilac flowers. 71/413 (syn. desquamatum) BH (+10). Lavender-mauve flowers. 73/130 FR: PHB (-10). Form with bright lavender flowers. 77/688 (syn. desquamatum) BRO (+10) 79/185 (syn. desquamatum) ACU Berry (+10) 80/151 Heritage Plantation, MA (0) 82/162 (syn. desquamatum) JCB (+10). 83/015 (syn. desquamatum) PC: WEB (+10) 83/223 ADB (-10). Form with white flowers. rubropilosum Tsutsusi (Azalea) Shrubs to 10 ft. Flowers (May-June) are pink to lavender with a dark mauve spots. Common and widespread in the wild, with a number of forms known. Found on open hillsides and steep slopes at 1,000 to 10,500 ft. Taiwan 73/241 USDA 325046 (+10). Upright habit producing pink flowers, stained reddish, collected by Dr. Creech in Taiwan. rugosum Vireya Shrubs or small trees up to 15 ft. Flowers (flowering time varies) are pink to crimson, deep magenta, bright purple or blood-red. Flowers can be scented. Found in mossy forests to open exposed ridges from 6,000 to 10,000 ft. North Borneo. 79/024 D. Stanton - EWS (+32) rupicola var. chryseum Lapponica Dwarf shrubs to 2 ft. Flowers (April-May) are creamy to greenish yellow. Free flowering and hardy. Found on granite screes and in alpine meadows and moorland at 11,000 to 15,500 ft. Burma, China 75/028 FR (-10). Form with clear yellow flowers. rupicola var. rupicola Lapponica Dwarf shrubs to 2 ft. Flowers (April-May) are purple, deep plum to almost black purple, occasionally deep crimson, or more rarely white. Noted for the often very dark purple-colored corollas. This species named after its native habitat as a dweller in stony places. Common and widespread on rocky slopes of mountainsides from 10,000 to 15,000 ft. N Burma, China 65/458 WIS (-5). Violet-purple flowers. russatum Lapponica Shrubs from 1 to 6 ft. Flowers (April) are deep indigo-blue to purple or rose-purple and sometimes white. Dark green ovate leaves with rust colored scales below. Perhaps the most brilliant purple-blue flowers in the genus. A variable species in habit with compact to upright forms. Highly prized by hybridizers. Found from 11,000 to 14,000 ft. China 66/602 CAE (-10). Deep green leaves speckled with dark scales and bright indigo-purple flowers. 70/367 KEW (-10). Form with deep purple flowers. 73/244 FR (-10). Bright purple flowers. 79/116 F 25500: BH (-10). Purple flowers. 80/052 Borde Hill 1st RHS (-10) 82/202 'Black Violet' WEB (-10). Dark violet flowers. S saluenense ssp. chameunum Saluenensia Compact dwarf shrubs to 2 ft. Flowers (April-May) are deep purple-rose to crimson. Attractive purplish leaves in winter. Widely distributed in the wild with the smallest leafed variants coming from the highest elevations. Commonly found in open meadows from 11,500 to 15,000 ft. China, NE Burma 73/246 (chameunum) EXB: WW: PHB (-5). An award form with bright purple flowers in late April. 80/076 (chameunum) CH (-5). Purple-rose flowers. saluenense ssp. saluenense Saluenensia Upright dwarf shrubs to 4 ft. Flowers (April-May) are magenta to deep purple with crimson spots. Forms vary in height and leaf size, sheen and hairs. Foliage is aromatic. Found on stony hillsides, cliffs and ledges from 10,500 to 14,500 ft. NE Burma, China. 69/876 R 110: WW (-5). Pink-purple flowers. 75/257 ACB (0) 82/163 Hu Yu: JCB (-5). Form with light purple flowers. sanctum Brachycalyx (Azalea) Deciduous shrubs to 15 ft. with a tree-like habit. Flowers (May-June) are deep rose or purplish-pink. Bright orange-red fall foliage. Rare in cultivation and a very limited distribution in the wild. Found in the sacred area of the great Shrine Ise. Japan. 73/250 GIG (0). Lavender-rose flowers. 76/080 MB (0) sanguineum ssp. didymum Neriiflora Dwarf shrubs, 1 to 4 feet. The short, tubular-campanulate flowers (June-July) are deep crimson to almost black-crimson, a pleasing contrast to the shiny foliage, Occurs in moist stony alpine meadows, rocky moorland, and on the margins of forests and bamboo groves at 14,000 to 15,000 ft. China (SE Tibet). 68/215 R 44: CHP (0). Black-crimson flowers. sanguineum ssp. sanguineum var. cloiophorum Neriiflora Dwarf shrubs, 1 to 4 ft. Flowers (April-May) are white to pink or yellowish-pink. Found among scrub and on open stony slopes at 10,000 to 14,500 ft. China 77/753 (sanguineum ssp. cloiophorum) F 25521 (=25943): WGP (0) sanguineum ssp. sanguineum var. haemaleum Neriiflora Dwarf shrubs, 1 to 4 ft. Flowers (May-June) are very dark crimson, almost black. Can be semi-deciduous. Found in open scrub and rocky forest margins from 10,000 to 14,000 ft. China 65/403 (sangueneum ssp. haemaleum) CRA (-5). Form with crimson flowers in late April. 80/123 (sanguineum ssp. haemaleum) HER (-5) 84/153 H.L. Larson (0) scabridibracteatum Euvireya (Vireya) Shrubs to 20 ft. Flowers (flowering time varies) are pale to dark red long tubes. Very dark scales cover leaves and flowers. Epiphytic or more rarely, terrestrial in tropical rain forests from 6,400 to 8,800 ft. Papua New Guinea 86/022 UCB 62-201-UCB (+32) scabrifolium var. scabrifolium Scabrifolia Shrubs to 10 ft. Flowers (April) are white to deep pink. Unusual bullate leaves. Native to dry hillsides and rocky slopes at 6,000 to 9,500 ft. China 70/155 BRO (0). Form with light pink flowers. scabrifolium var. spiciferum Scabrifolia Shrubs to 6 ft. Flowers (April) are rose to pink or white. Leaves with soft hairs. Native to dry rocky slopes, pine woods, thickets and scrub at 8,000 ft. China. 64/106 (syn. spiciferum). BRO (+5). Rose-pink flowers. 80/161 (syn. spiciferum) PM (-5). Form with light pink flowers. schlippenbachii Sciadorhodion (Azalea) Deciduous shrubs to 15 ft. Flowers (May) are pale pink to rose-pink, occasionally white, and with reddish-brown flecks. Sometimes scented. Commonly called the Royal Azalea, this species in particular prefers some shade. Excellent autumn color. Found abundantly in open woodland. Korea, NE Manchuria IJ028 Seedling of [64/199 Hiller] (-25) 80/163 ESC: VVN: KWG (-25). Pink flowers. 90/SD2 Seedling KOR. 90/SD3 Seedling KOR. scopulorum Maddenia Shrubs to 8 ft. Flowers (April-May) are white, sometimes flushed rose with a yellow blotch. A tender species with a limited distribution and may or may not be fragrant. Found on forested slopes 6,500 to 8,000 ft. China 80/135 Trengwainton (+32) searleanum Solenovireya (Vireya) Shrubs to 13 ft. Flowers pale outside, dark rose inside, sometimes white. Carnation scented. Found at 7,000 ft. New Guinea 80/148 BOS (+32) searsiae Triflora Shrubs, 8 to 15 ft. Flowers (April-May) are white or pale purple with green spots. Known only from two collections from thickets and woods at 7,500 to 10,000 ft. China 70/125 GLE (0). Form with yellow flowers. selense ssp. dasycladum Selensia Shrubs, 3 to 12 ft. Flowers (March) are white to rose. This is a variable subspecies and many forms have been collected from the wild. Native to bouldery slopes and open pine forests from 11,000 to 13,000 ft. China 79/107 (rhaibocarpum) R 11269 (USDA 59197) BH (+10) selense ssp. jucundum Selensia Shrubs, 2 to 20 ft. Flowers (March) white to white flushed rose, rose, or pink, sometimes with a crimson blotch. A geographically distinct subspecies from NW Yunnan, China. Found on the edges of pine woodlands and on rocky slopes from 10,000 to 12,000 ft. 82/138 (jucundum) BREM (0). Pastel rose flowers with a magenta blotch. selense ssp. selense Selensia Shrubs, 2 to 9 ft. Flowers (April-May) are pink to rose, occasionally white to pale yellow, may be blotched. Found on rocky alpine pastures by streams at 11,000 to 14,500 ft. China 76/312 ACB (0) selense ssp. setiferum Selensia Shrubs, 5 to 10 ft. Flowers (March) creamy white with red-colored flecks. Possibly a natural hybrid between R. selense ssp. selense and R. bainbridgeanum. Found in thickets and woodlands of pine from 12,000 to 13,000 ft. in China (NW Yunnan and SE Xizang). 65/521 (setiferum) WIND (0). Creamy white flowers with maroon flecks. semibarbatum Mumeazalea Deciduous shrubs, 2 to 10 ft. Flowers (June) are white or flushed pink or yellow with red spots. Often with red, crimson, orange, or yellow leaves in autumn. Found in the open and in woods on mountainsides below 6,000 ft. Japan 75/077 WAK (-5). Small white flowered form, pink and red autumn foliage. 81/067 NA 44823-USNA (-5) serpyllifolium Tsutsusi (Azalea) Semi-deciduous shrubs to 4 ft. Flowers (April-May) are pale pink to white. Perhaps the smallest leaves and flowers in the genus. Found on well-drained volcanic soils up to 6,000 ft. Japan 76/356 HSZ: WEB (-5) 79/173 WEB (-5). Form with delightful fuchsia colored flowers. 79/175 WEB (-5). Form with lavender purple flowers. serrulatum Pentanthera (Azalea) Deciduous shrubs to 15 ft. Flowers (July-August) are white or occasionally pale pink. One of the latest to bloom and has a pleasing sweet, clove-like scent. Found on coastal plains or the edges of wooded swamps. SE USA 76/282 HTS 1227B: NA 7853-USNA (-5). Fragrant white flowers. Collected from the wild in Jones County, Mississippi. 76/283 HTS 1280 - USNA (-5). Fragrant white form from Screven County, GA. 76/284 (serrulatum var. georgianum) HTS 1265E: NA 7906-USNA (-5). Wild collected in Charleton County, Georgia. setosum Lapponica Dwarf shrubs to 1 ft. Flowers (May) are purple or pinkish or dark wine-red. New growth is very bristly. Native to open rocky slopes and alpine meadows at 12,000 to 15,000 ft. Himalayas 79/055 WEB. From seed collected on Mt. Everest. sheilae Euvireya (Vireya) Shrubs to 5 ft. Funnel-shaped flowers (variable flowering time) are deep purple-red. Oblong to obovate leaves in pseudowhorls. Dr. Hermann O. Sleumer states that this species is, "presumably a more or less intermediate hybrid between R. abietifolium and R. Buxifolium var. robustum." A subalpine species found on boulders, ridges, and among the dense vegetation of low trees and shrubs at 9,000 to 10,000 ft. on the eastern side of Mt. Kinabalu on the island of Boreno. Malaysia (Sabah). 87/048 GA 801154: RBG (+32). sherriffii Fulgensia Shrubs or small trees, 12 to 20 ft. Flowers (April) are deep carmine with darker nectar pouches. Rounded leaves with a thick chocolate-brown indumentum. Rare in cultivation. Found on steep mountain slopes near the tree line at 12,000 to 13,000 ft. China 75/012 HIL (+5). Funnel-campanulate corollas of dark crimson. 75/238 WEB (+5). Cherry red three flowered trusses. 76/155 L&S 2751: WGP (+5). Crimson flowers. AM 1966. 76/193 RBG (+5). sidereum Grandia Shrubs or small trees, 10 to 30 ft. Flowers (May-June) are cream to clear yellow, sometimes with a red basal blotch. Lower leaf surface with a light tan indumentum. Native to thickets, mixed forests and open conifer woods at 8,000 to 12,000 ft. Burma, China 73/255 KW 20838: WW - PHB (+10). Form with cream yellow flowers. siderophyllum Triflora Shrubs, 4 to 23 ft. Flowers (May) are white or pinkish-violet. Found on open ridges and dry, wooded hills at 2,700 to 6,900 ft. China 80/102 BEN (0) simsii Tsutsusi (Azalea) Semi-evergreen shrubs to 8 ft. Flowers (May) are various shades of red with a darker blotch. The parent of the florist hybrid azaleas but hardy only in warmer gardens. The most popular garden plant in China and many unusual forms available. Native to dry slopes and boulders of riversides at 1,000 to 8,000 ft. NE Upper Burma, Thailand, Taiwan, China 80/014 USNA 40245 (+5). Light pink flowers, and vigorous spreading habit. 80/018 USNA 43660 (+5). Simple bright pink flowers in this form. 83/218 Arb. des Barres (+5) simulans Taliensia Shrubs to about 6 ft. Flowers (May) are white to rose with purple flecks. Very limited distribution in the wild and not well documented. Found among rhododendron thickets from 12,000 to 14,500 ft. China 76/168 (mimetes var. simulans) F 20428: RBG (0) smirnowii Pontica Shrubs, 3 to 12 ft. Flowers (May-June) are pink with yellowish flecks. A very useful hardy species with soft pale colors. Leaves with a thick tan indumentum below. Native to the edges of forests from 4,000 to 7,500 ft. NE Turkey & adjacent USSR 83/210 ACB - BON (-25). Flowers pink 83/193 MEH ((25). Flowers pastel rose with gold-green flecks. 76/376 BERG ((25). Flowers pastel rose with darker lobes and gold-green flecks. smithii Barbata Shrubs or small trees, 6 to 25 ft. Flowers (March) are scarlet to crimson with darker nectar pouches. Found in mixed forests from 8,500 to 12,000 ft. NE India, Bhutan, China 65/255 STR (+5). Form with brilliant red flowers. 75/061 (argipeplum) WAK (+5). Form with scarlet flowers. souliei Campylocarpa Shrubs, 4 to 17 ft. Flowers (May) are pink or white flushed pink and saucer-shaped. Glaucous blue-green new growth. Native to oak and spruce forests and on mountain summits among boulders at 9,000 to 14,000 ft. China 79/041 DUR (-5) sperabile var. sperabile Neriiflora Shrubs, 3 to 6 ft. Flowers (April) are crimson to scarlet. Needs some protection in most gardens to produce good foliage and flowers. Found among scrub and on cliffs at 10,000 to 12,000 ft. China, NE Upper Burma 79/119 KW 7124 - Borde Hill (+10) sperabile var. weihsiense Neriiflora Shrubs, 3 to 6 ft. Flowers (April) are scarlet to crimson. Leaves with a pale whitish indumentum. From a more northerly distribution than variety sperabile. Found on cliffs and rocky slopes at 9,000 to 13,000 ft. China, Burma 70/310 Forrest 26478: NYM - UBC (+10). Form with deep scarlet flowers. sphaeroblastum Taliensia Shrubs, 3 to 20 ft. Flowers (April-May) are white to pink with purple flecks. A handsome hardy foliage plant, typically slow to flower. Found in open forests and thickets from 11,000 to 15,000 ft. China 64/145 COR (0) 67/688 Glendoick (0) 83/011 HLL (0). Form with white flowers. spinuliferum Scabrifolia Shrubs to 8 ft. Flowers (April) are pink, orange, brick or crimson red. Bristly new growth and unique upright tubular flowers. Found in dense scrub and shady thickets at 6,000 to 8,000 ft. China 87/012 SBEC (+10). 87/014 SBEC (+10). stamineum Choniastrum Small trees, 10 to 40 ft. Flowers (May) are white with a yellow blotch and scented. Found in mixed forests and thickets at 1,500 to 9,000 ft. China 70/369 Kew - UBC PP (+10). White scented flowers on an open wide ranging shrub. stenaulum Choniastrum Shrubs to 15 ft. Flowers (March-April) pale lilac, greenish yellow in the throat and scented. Found at 9,000 ft. China 75/040 KW 20679: KEW (+20). Fragrant. stenophyllum Euvireya (Vireya) Shrubs to 3 ft. Flowers (variable flowering time) are bright to dark red or orange-scarlet. Almost needle-like leaves that are a tad over two inches long and only one sixteenth of an inch wide. Found on the island of Borneo and common in the upper montane oak forests on Mt. Kinabalu and also in mossy forests, on mountain ridges, on river banks from 5,000 to 10,900 ft/ Indonesia, Malaysia 85/046 FM: DC (+32) stewartianum Thomsonia Shrubs from 2 to 10 ft. Flowers (March) are white or cream to pale rose or crimson. Oval leaves with a thin veil of hairs below. Found on windswept hillsides and stony slopes at 10,000 to 14,000 ft. China, Burma 67/684 COR (0) strigillosum Maculifera Shrubs or small trees, 3 to 20 ft. Flowers (February-March) are deep red to crimson-scarlet with dark nectar pouches. Attractive lance-shaped leaves, stems and petioles covered with stiff bristles. Found in mixed forests and open slopes from 8,000 to 11,5000 ft. China 75/178 GRE: WW (-5). One of our best forms with crimson flowers. 76/081 WEB (-5). Crimson flowers. 77/627 GRE - PM (-5). Form with crimson flowers. 77/627 GRE-PM (-5). Crimson flowers. 79/057 BN: WEB (-5). 82/125 RBG (-5). The best strigillosum at Edinburgh in Mr. Davidain's opinion. 84/047 STN (-5). Deep red flowers. suaveolens Solenovireya (Vireya) Shrubs or small trees to 10 ft. Flowers (flowering time varies) are white and can be fragrant. Easier to grow and flower than R.orbiculatum, but appreciates some support. Found on the island of Borneo in tropical rain forest from 5,000 to 6,500 ft. Indonesia, Malaysia 80/004 DG (+32). Collected wild on Mt. Kanabalu, Borneo. 87/051 RBG 792883: CLL (+32) subansiriense Thomsonia Shrubs or trees to 45 ft. Flowers (February-March) are scarlet with a few purple flecks. A recently collected (1965) species related to R. thomsonii with similar red colored flowers and peeling bark but with elongated leaves and more tubular flowers. Found in mossy rain forests at 8,500 to 9,200 ft. NE India 77/636 C&H 418: GLE - WEB (+10). A red flowered form. Blooms in March. 80/170 RBG - LB (+10). Form with light red flowers. succothii Barbata Shrubs or small trees, 3 to 20 ft. Flowers (March) are crimson or scarlet with large nectar pouches. Smooth, peeling purple bark. Native to mixed forests and scrub at 11,000 to 13,500 ft. Bhutan, India 83/038 BEN: TJ (+5) Form with deep red flowers. sulfureum Boothia Shrubs, 2 to 5 ft. Flowers (March) are greenish or bright yellow. Very variable species in habit and hardiness. Found growing on rocks, occasionally epiphytic at 8,000 to 12,000 ft. NE Burma, China 74/108 Glendoick (+10). A hardy form with sulfur yellow flowers, and eventually smooth brown bark. superbum Vireya Tropical shrubs to 6 ft. Flowers (flowering time varies) are white to creamy yellow. The dramatic large leaves are covered with rough scales. Large scented flowers appear on mature plants. Native to Papua New Guinea at 5,000 to 10,000 ft. 78/094 FM (+32). Three large flowers per truss, the petals form a cream tube that is soft pink on the lobes. sutchuenense Fortunea Large shrubs, 15 to 35 ft. Large leaves up to one foot long. Flowers (January to April) pale pink to pale mauve-pink with no basal blotch. A beautiful large, early flowering species which performs best in woodland conditions. Hardy even in the eastern half of the USA as far north as Boston. Native to China (Shaanxi, N Sichuan, Hubei, Guizhou, and Guangxi) where it grows in forests and bamboo groves from 5,000 to 8,000 ft. 65/348 Caerhays - UBC PP (0). A typical form of this handsome small tree. 77/205 VANW ((10). Large pale pink flowers with maroon flecks. 82/197 AC (-10) 79/120 ('Seventh Heaven') Wilson 1232: BH (-10). Flowers white suffused reddish-purple. T taliense Taliensia Shrubs, 2 to 15 ft. Flowers (April-May) white, white flushed pink, creamy yellow, or rarely yellow, often with crimson flecks. An attractive plant with a compact habit and dark indumentum. Native on both sides of the Tali Mountain Range in Yunnan Province, China. Found on rocky slopes and meadows or in thickets from 10,000 to 13,000 ft. 65/292 BEN - UBC (-10). Form with cream colored flowers. 82/139 BRP (-10). 83/029 TJ (-10). tamuare Low growing azalea. Flowers are red to purplish red to pink and occasionaly white. Rare in the wild and in cultivation. Considered one of the parents of the Satsuki Azaleas. Found on the islands south of Kyushu at low elevations from sea level to rocky hillsides. Japan 80/014 (eriocarpum) USNA (+10). From seed collected on Yaku Island, Japan. tapetiforme Lapponica Low dense shrubs which can reach 3 ft. Flowers (April) are purplish-blue, violet, rose or rarely yellow. A species that is rare in cultivation and forms a dense ground cover. Found on open alpine slopes and bare scree from 11,000 to 15,000 ft. NE Burma, China 83/135 RBG (0) tatsienense Triflora Shrubs to 18 ft. Flowers (April) are rose to pink to pale lavender. A variable species and common in the wild. Native to scrub, moist meadows and open forest margins at 7,000 to 13,000 ft. China 70/422 RBG (+5). Form with soft rose-mauve flowers. telmateium Lapponica Bushy dwarf shrubs to 3 ft. Flowers (April-May) are lavender to purple, or rose-pink. Very common and variable in the wild and relatively easy to cultivate. Found on open rocky slopes and cliffs at 9.500 to 16,000 ft. China 77/757 F.21250 - Windsor (-5) 77/758 F.21377 - Windson (-5). One-half inch flowers of soft mauve in this selection. 77/759 KW 4102: WGP (-5). From seed collected by F. Kingdon Ward during his 1921 expedition to Yunnan and Sichuan. 80/006 (drumonium) F.15210 - Castle Howard (-5). Although many clones seen are labeled as such, this is a true form. temenium var. dealbatum Neriiflora Dwarf shrubs to 4 ft. Flowers (April) are white to deep rose-pink in lax trusses. Grows among scrub, on rocky cliffs, and in open moorland from 12,000 to 15,000 ft. China 76/196 (glaphyrum) RBG (0) temenium var. gilvum Neriiflora Dwarf shrubs to 4 ft. Flowers (April) are pale yellow to yellow tinged with pink. Found on cliff ledges, among scrub, and in thickets at 12,000 to 15,000 ft. China 79/165 (temenium ssp. chrysanthum 'Cruachan') GLE (0) tephropeplum Tephropeplum Shrubs, usually only to 5 ft. Flowers (April-May) are pink to carmine-red, rarely white. Found on rocky slopes and scree at 8,000 to 14,000 ft. India, NE Burma, China 65/257 KW 20844 - Stronachullin (+10). Clusters of three- quarter inch carmine rose bells in late April on a shrub of medium growth. thayeranum Argyrophylla Shrubs, 6 to 12 ft. Flowers (June) are white tinged with pink and slightly speckled. A very distinct late flowering species with remarkable stiff foliage and white-to-green candles of new growth. Leaves are indumented. Found in woodlands from 9,000 to 10,000 ft. China 66/605 CAE (-5). Form with evenly spaced trusses of white flowers. 66/617 RBGE ((5). Rose buds opening white with maroon flecks. thomsonii ssp. lopsangianum Thomsonia Shrubs 2 to 6 ft. Flowers (April) are deep crimson. Small oval leaves with tubular bell-shaped blossoms. Found on open hillsides and rocky slopes at 8,500 to 14,000 ft. China 77/696 BRO (+5). Crimson flowers. thomsonii ssp. thomsonii Thomsonia Shrubs or small trees, 2 to 20 ft. Flowers (April) are deep crimson. Hardy enough for most gardens and highly desirable large flowers with many flowered trusses. Has beautiful peeling red bark. Found in mixed scrub and woodland at 10,000 to 13,000 ft. N India, Bhutan 76/716 L&S 2847 - RBG (-5). A hardy clone with unusually large leaves and large red flowers with red calyxes. 75/237 TRW: WEB (0). Warren Berg's choice as the best pure red thomsonii from the gardens of Cornwall. 80/082 GLE (0) tosaense Tsutsusi (Azalea) Semi-evergreen shrubs to 6 ft. Flowers (April-May) are purple-red to pink, with or without darker flecks, rarely with a faint pink flush. Native to the islands of Kyushyu, Shikoku, and on Honshu in southern areas. Common on exposed sites to 1,000 ft. Japan 79/016 USNA 40870 (0). Lavender-pink flowers with ten stamens, this form from seed collected on Ashitaka Yama in Japan. 79/087 ('Barbara') HIL: LJP (0). Vibrant pink flowers traillianum var. dictyotum Taliensia Small shrubs, 4 to 5 ft. Flowers (May) are white and sometimes spotted with crimson. Considered a rare plant in cultivation. Found on scrub-clad slopes and on margins of conifer forests from 11,000 to 14,000 ft. China 65/508 (dictyotum) Rock 18437: WGP (0). Form with white flowers. 75/084 (dictyotum 'Katmandu') Exbury (0). Softly grained indumentum and flowers of fine white-blotched and spotted crimson. An Award of Merit form, 1966. trichanthum Triflora Shrubs, 3 to 20 ft. Flowers (May-June) are light to dark purple. A late flowering species with very deep colored forms. Lance-shaped leaves are partially scaly on top. Found commonly in dense thickets and woods at 7,500 to 10,000 ft. China 69/723 Brandt - M. Walker (-5). 75/169 'Tower Court Form' Wales Wood (-5). Named for its covering of bristles on stems, petioles and pedicels. Flowers of a rich purple. 76/059 JHC (-5). Form with deep royal purple flowers. 76/346 KSG (-5). Form with mid-May flowers of deep purple with green blotch. trichocladum Trichoclada Deciduous shrubs to 5 ft. Flowers (April-May) are yellow or greenish orange-yellow. Bronze colored new growth. Native to rocky cliffs and scrub at forest margins from 8,000 to 11,000 ft. N Burma, China 78/091 BAR - CHP (0). Form with greenish-yellow flowers. 80/160 (oulotrichum) P. Miller (0). trichostomum Pogonanthum Spreading shrubs to 4 ft. Flowers (May-June) are white or pink. Many varieties are in cultivation and vary in hardiness and flower size. Noted for its attractive globular trusses. Native to both dry and moist slopes and thickets at 11,000 to 15,000 ft. China 73/283 FR (-5). Form with light pink flowers. 80/164 ('Rae Berry') BON (-5). Form with mid-season pink flowers from deep pink buds. 82/164 JCB (-5). Hardy form with light pink flowers. triflorum var. triflorum Triflora Shrubs, 3 to 20 ft. Flowers (May) are cream to yellow with greenish yellow or dark red spots. Native to forest margins, moist hillsides and cliffs at 9,000 to 12,000 ft. Himalayas 70/026 (triflorum var. mahoganii) FR (+5). Form with light yellow flowers and a mahogany blotch. triflorum var. bauhiniiflorum Triflora Shrubs, 2 to 15 ft. Flowers (May) are greenish-yellow to yellow and with darker greenish-yellow spots. The corolla is flat and saucer-shaped in this variety. Found in the states of Nagaland and Manipur in eastern India. Common on hillsides at 8,000 to 9,000 ft. E India 73/026 (bauhiniiflorum) FR (+5). Lemon-yellow flowers. triflorum var. triflorum Triflora Shrubs, 3 to 20 ft. Flowers (May) are cream to yellow with greenish-yellow or dark red spots. The corolla is widely funnel- shaped in this variety. Native to mixed and conifer woodlands, bogs, on cliffs, and in bamboo or rhododendron thickets at 9,000 to 12,000 ft. Nepal, NE India, Bhutan, N Burma, SW China 80/097 KW 6409: (+5) tsariense Lanata Shrubs, 3 to 10 ft. Flowers (April) are white to cream to pale pink with or without crimson spots. Striking wooly branchlets and leaves with dense fawn to rust-colored indumentum. Found on open hillsides and in mixed forests from 11,000 to 14,500 ft. SW China, NE India 66/653 GREI:WAL (0). Carmine-rose in bud opening to white flowers. 75/150 NEL:ROBB (0). Deep carmine-rose in bud opening to white flowers with magenta flecks. 77/665 Windson (0). A clone of compact habit with deep pink buds and eventually almost white flowers. An Award of Merit form. 82/180 TJ (0). 84/043 STN (0). Creamy white flowers from pink buds. tsusiophyllum Tsusiopsis (Azalea) Semi-deciduous shrubs to 2 ft. Flowers (June) are white and tubular. Limited distribution in the wild forming large mats on mountainsides. Japan, Taiwan 76/353 WEB (-5). White flowers. U ungernii Pontica Shrubs or small trees, 5 to 20 ft. Flowers (July) are white, sometimes flushed pink, with greenish flecks. An Excellent foliage plant that needs a moist, shady spot to succeed. Native to spruce forests from 3,500 to 6,000 ft. NE Turkey and adjacent USSR. 76/061 JC (0). uniflorum var. imperator Uniflora Prostrate shrubs rarely attaining 1 ft. in height. Flowers (April) are purple to pinkish-purple. Narrow funnel-shaped flowers on a ground-hugging mat. Found on bare cliff ledges at 10,000 to 11,000 ft. NE Burma. 65/422 (syn. imperator) WAK (0). Rose-purple flowers. uvarifolium Fulva Large shrubs or small trees to 35 ft. Flowers (March-April) are white to pale pink, with a small blotch. A variable species in leaf shape and flower size and color. Dark green leaves contrast nicely with the lighter indumentum below. Commonly found on open rocky slopes and the edges of forests at 8,000 to 13,000 ft. China 76/250 (uvarifolium var. griseum) BEN (-5) V valentinianum Maddenia Compact shrubs to 4 ft. Flowers (March-April) are bright yellow. Very distinct dark hairy leaves and richly colored flowers on a tender shrub. Found growing on cliffs and stony slopes from 9,000 to 12,000 ft. NE Burma, China. 65/391 Bodnant (+10). Bright yellow flowers, small leaved and slight stature. An Award of Merit form, 1936. vaseyi Rhodora (Azalea) Upright shrubs to 15 ft. Flowers (May-June) are pale pink to rose or deep pink with green or red-orange spots, or rarely white. Strikingly beautiful in flower and attractive autumn color. Very hardy and adaptable native American deciduous azalea. Found in mountainous ravines and streamsides at 3,000 to 5,500 ft. E USA 75/032 'White Find' Labar (-15_ Pristine white in this form, with outstanding yellow to red fall color. 78/014 LF-GBN (-15). Form with rose-pink flowers. 81/077 BIL (-15). One of the best pink forms of this eastern azalea. veitchianum Maddenia Shrubs to 6 ft. Flowers (February-May) are white, often with a yellow blotch and can have a heavy, sweet scent. Winter- hardy only in warmer climates but a worthwhile greenhouse plant at more northerly latitudes. Usually found growing as an epiphyte on trees or rocks from 5,000 to 8,000 ft. Burma, Laos, Thailand 74/001 (cubittii 'Ashcombe') WGP (+32). Large fragrant white flowers with a yellow butterscotch blotch. 81/127 SA-EK (+20). Light chartreuse buds open white flushed yellow in the throat. venator Venator Shrubs to 10 ft. Flowers (May) are crimson with dark nectar pouches. Found only in limited area in the Tsangpo Gorge of Tibet in thickets, swamps, and on cliffsides at 8,000 ft. China 65/381 RBG (+5). Form with scarlet flowers. 69/833 GRE-MVW (+5). Crimson flowers. vernicosum Fortunea Shrubs or trees to 25 ft. Flowers (April) are pale rose to pinkish-purple with crimson flecks. Fairly common and widespread in thickets, mixed forests and open slopes from 9,000 to 12,000 ft. China (NW Yunnan, SW Sichuan, SE Tibet). 69/812 RL-MVW (-5). Form with pink flowers. 78/112 Dexter - UW Arb. (-5). 79/152 HSM 13976: GBG (0). 79/144 (vernicosum f. euanthum) F#5881:RBGE ((5) verruculosum (Possible Hybrid of R. flavidum) A shrub to 3 ft. Flowers (May) are deep lavender. Small leaves on plant formerly recognized as a species. Collected from W Sichuan art 10,000 ft. China. 65/461 Wisley (0). Deep lavender flowers. virgatum ssp. oleiofolium Virgata Shrubs to 5 ft. Flowers (March-May) are white or pink. A Subspecies with smaller paler flowers that tolerates a warm, dry site. Found on open scrubby sites from 6,500 to 13,000 ft. 84/072 (oleiofolium) KW 6279: Brodick (+15) virgatum ssp. virgatum Virgata Heat tolerant shrubs to 8 ft. Flowers (March-April) are pale to deep pink, rarely white. Found at forest margins and dry scrubby slopes from 8,000 to 12,500 ft. Nepal, India, Bhutan, China. 65/404 Crarae (+10). Rose pink flowers. 66/672 R.183 or 185 - WW (+10). 80/038 Brodick (+10). White flowered form. viscidfolium Thomsonia Shrubs, 2 to 8 ft. Flowers (April-May) are coppery red to coppery-orange with darker nectar pouches and flecks. Unusual-colored flower on a species rare in cultivation. Found on cliff faces near streams and waterfalls at 9,000 to 11,000 ft. China 65/297 L&S 6567: GLN (0). Form with unique copper-orange flowers. viscistylum Brachycalyx (Azalea) Deciduous shrubs to 10 ft. Flowers (June) are reddish-purple to purple with darker flecks. Native only in southern areas on the island of Kyushyu. Recently confirmed specific status by D.F. Chamberlain and S.J. Rae in the Edinburgh Journal of Botany, Volume 47, No. 2,1990. Found in upland forests. Japan 77/028 MG (0) viscosum Pentanthera (Azalea) Deciduous stoloniferous shrubs, 3 to 15 ft. Flowers (May-June) are white to light pink with a spicy fragrance. Yellow- orange autumn color. Commonly called the Swamp Azalea, this species native from Maine to Florida, west into Ohio, and from Alabama to southeast Texas. Found in low marshes, on river banks, and in mixed forests of the Appalachian Mountains. E USA 76/287 (syn. viscosum var. aemulans) HTS 1104: USNA (-15). Propagated from a plant collected in Henry Co., AL 76/288 HTS 1325A: NA 10086-USNA (-15). Collected from the wild in Lebanon County, Pennsylvania. 78/110 KWG (-15). Propagated from a plant collected in Anne Arundel Co., MD 80/025 KWG (-15). Propagated from a plant found in Hyannis, Massachusetts. 90/SD4 Seedling BOW. 90sd006 Seedlings ( grown from seed collected at Bowman's Hill Wildflower Preserve, Washington Crossing, Pennsylvania. W wallichii Campanulata Shrubs to 20 ft. Flowers (April) are pale lilac to violet to pink or white, sometimes spotted. Discovered by J. Hooker in 1849. Native to birch and spruce forests and juniper scrub at 9,500 to 13,000 ft. Himalayas 75/080 LS&H 17527: WAK (-5). Form with delicate lavender 75/128 SH#6658:RBGE (0). Pastel rose-purple flowers. flowers. walongense Maddenia Shrubs to 10 ft. Flowers (April-May) are creamy-white with a greenish blotch and may have a spicy scent. Native to the Arunachal Pradesh territory of India. Rarely epiphytic in trees or terrestrial in forested ravines and on rocky cliffs at 5,000 to 7,000 ft. NE India 87/060 RBG 774055-RBG (+32) wardii var. wardii Campylocarpa Shrubs or small trees, 3 to 25 ft. Saucer-shaped flowers (May) are yellow to sulfur-yellow and may have a maroon or purple basal blotch. A parent of many beautiful yellow-flowering hybrids, but in its finest forms this species is exceptional in and of itself. Native to Sichuan, Yunnan, and SE Xizang, China. Found in forests of pine, spruce, and fir, near swamps, on open slopes, among scrub, and in thickets of oaks and hollies from 9,000 to 14,000 ft. 65/327 'Meadow Pond' LS&E 15764: WGP (-5). Received an Award of Merit in 1963 for its primrose-yellow flowers with a crimson blotch. 69/096 L&S 15764: WGP (-10) 70/059 (=73/296) KW#4170:EXB:PHET ((10). Orange-yellow buds open to yellow flowers. 73/296 KW 4170: EXB: CHP (-10). An early season, unblotched, clear yellow form. Our hardiest form. 74/044 LS&T 5679: RBG (-5). Form with lemon-yellow flowers marked purplish-red. 75/129 SH 6596 (-5). This form with small rounded leaves and rather late season flowers are pure yellow and marked with a deep crimson nectar guide. 80/063 (litiense) MIN: RKB (0) wasonii Taliensia Low growing shrubs, 2 to 5 ft. Flowers (April) are yellow to white to pink, with purple spots. Leaves with a sparse to dense indumentum. A variable species with several forms in cultivation. Found on cliffs and boulders at 8,000 to 11,000 ft. China 65/258 STR (0). Form with light yellow flowers. 65/303 RBGE ((5). Flowers white, lightly blushed rose with a few maroon flecks 74/036 (syn. wasonii var. rhododactylum) W 1876: WGP (0). White flowers. 76/267 WGP (0). 82/181 TJ (0). Pink flowered form. 83/108 (syn. wasonii var. rhodoactylum) REU: ADM (0). websteranum var. websteranum Lapponica Upright, branched shrubs to 5 ft. Flowers (April) are pale purple. Native to heath and moorlands at 10,000 to 16,000 ft. China 65/462 WIS (0). Vigorous dwarf with lavender flowers. westlandii Chioniastrum Shrubs, 5 to 25 ft. Flowers (March) are lilac to clear orchid- purple to white and very fragrant. One of the least hardy of this section, but unusually lovely flowers. Found at forest margins and steep slopes at 2,500 ft. China. 65/462 Wisley (0). Tiny, narrow leaves and lavender flowers on a vigorous dwarf. weyrichii Brachycalyx (Azalea) Small deciduous trees to 15 ft. Flowers (April-June) are salmon- pink to brick-red or purple, rarely white. Several forms available with warm autumn foliage from yellow to red on plants with an elegant branching habit. Found at lower elevations in scrubby thickets and woodlands. Japan, Korea 73/298 USDA 274839-USDA (0). Form with light orange-red flowers in May. Yellow to red autumn color. 81/071 NA 45300-USNA (0) 81/073 USNA#45300:USNA (0) wightii Taliensia Shrubs, 7 to 20 ft. Flowers (April) are pale to lemon-yellow with brown or purple spots. Common above tree line where it is found among scrub and on ridges at 11,000 to 15,000 ft. Himalayas 75/210 PTG (-5) williamsianum Williamsiana Dense spreading shrubs, 2 to 5 ft. Flowers (April) are pink to rose with darker flecks. Attractive bronze colored new growth. A distinctive species with a mounding habit and ovate-orbicular leaves, has no close allies. Popular in hybridizing. Rare in the wild, found on cliffs at 8,000 to 10,000 ft. China 66/606 CAE (-5). Form with delicate pink bells in early spring. 73/301 Greig: WW (-5). Clone with small, flat, round leaves and light pink, cup shaped flowers/ 73/302 AEK (-5). Rose flowers. 74/113 FR (-5). 75/277 GRE: UBCP (-5). Clone of typical leaves and open cup-shaped pale rose flowers. 75/307 BAR: CHP (-5). Low mounding form creates a striking focal point as plants mature in your garden. Delicate pinkbells. 80/004 FOX: ARD (-5) 80/055 Borde Hill (-5). Tight compact spreading shrub, up to 4" in 10 years. wiltonii Taliensia Shrubs, 3 to 15 ft. Flowers (April-May) are white to pink with or without red flecks. A very distinct species with its unusual shiny, bullate foliage and no close allies. Found on rocky pastures and slopes at 8,000 to 11,000 ft. China 75/017 HIL (-5). White flowers from pink buds. 75/326 GRE: CHP (-5) 76/116 J. Caperci (-5). womersleyi Euvireya (Vireya) Shrubs to 7 ft. rarely epiphytic on tree trunks. Tubular, nodding flowers (variable flowering time) are bright to deep red or scarlet. Leaves, ovate to ovate-elliptic, are densely set along the branches. Found mostly in open mossy forest or among grasses on the margins of forests, more rarely in grassland above the timberline at 10,5000 to 12,100 ft. Papua, New Guinea. 84/162 FM (+32). Propagated from a plant collected on Mt. Giluwe, Papua New Guinea. X xanthostephanum Tephropepla Shrubs which can reach 10 ft. Flowers (April) are deep lemon to creamy yellow. Smooth reddish-brown bark. Suitable for only the mildest gardens but highly desirable for its double forms. Found in forest margins and scrub at 5,000 to 10,000 ft. India, NE Burma, China 66/677 R.15 - WW (+15). A compact and hardier clone with bright yellow funnel shaped flowers. 77/666 ('Yellow Garland') Forrest 21707: WGP (+15). An award form with true yellow flowers. AM 1961 Y "yakushimanum" (see degronianum ssp. yakushimanum) or yakushimanum Pontica Dense mounding shrubs, 3 to 8 ft. Light pink or rose buds opening to white or white flushed pink flowers (May) with or without faint pink flecks. Dwarf to semi-dwarf habit, foliage with thick white to fulvous indumentum, and exceptional flowers make this one of the most popular species. Native solely to Yaku Island in conifer forests and on exposed mountain slopes from 1,500 to 6,500 ft. Japan 64/012 'Koichiro Wada' WGP-ACL. An award form similar to the Exbury form, flowers deep pink in bud, opening white. FCC 1947 73/308 RCH (-15). A very dwarf form. 73/310 EXB-PHB (-15). Form with apple blossom pink flowers. 75/184 'Yaku Angel' CS (-15). A more vigorous form with larger trusses of white flowers. 75/260 (75/241) 'Exbury Form' EXB: FR (-15). Perfection of dome shaped habit, deep green, heavily indumented foliage and apple blossom pink flowers. 77/649 'Pink Parasol' D. Leach (-15). A possible hybrid with large leaves and deeper pink flowers than average. 82/073 'Baron Lionel' EXB: UBC (-15). 83/100 ADM (-15). A dwarf form with pale rose flowers. yedoense var. poukhanense Tsutsusi (Azalea) Semi-deciduous shrubs to 5 ft. Flowers (April-May) are rose to pale lilac and slightly fragrant. One of the hardiest azaleas and much used in hybridizing. Has relatively large flowers that appear on young plants. Found in large masses on open grassy slopes from sea level to 5,000 ft. Korea. 78/020 'Eizanko' Suzuki - WEB (0). yungningense Lapponica Rounded compact shrubs, 1 to 4 ft. Wide, funnel-shaped flowers (April-May) are deep purple, blue-purple, or purple-red, rarely white, and produced in great abundance on this vigorous species. Occurs on alpine meadows, stony moorlands, cliffs and rocky areas from 11,000 to 14,000 ft. China (SW Sichuan, N Yunnan). 83/137 F 16282: RBG (0). yunnanense Triflora Shrubs, 3 to 18 ft. Flowers (April-May) are white, pink or lavender. A variable, widely distributed common species. A vigorous grower that varies in hardiness. Very highly regarded in Great Britain. Found on cliffs and forest margins from 6,000 to 13,000 ft. NE Upper Burma, China 70/333 FOR (0). Form with white flowers accented with orange spotting. 80/033 EM (0). Form with light pink flowers. 83/111 ADM (0). Form with lavender-pink flowers. Z zaleucum Triflora Shrubs, 6 to 26 ft. Flowers (April-May) white, white flushed pink of lavender. A distinct species with a rather southerly and low altitude distribution. Found in scrub, thickets and forest margins at 5,800 to 9,800 ft. N Burma, China 77/680 CRA (+10). Highly praised form with large mauve-pink flowers. zoelleri Euvireya (Vireya) Tropical shrubs or small trees to 20 ft. Flowers (flowering time varies) are yellow to orange or reddish-salmon and can have orange-red lobes. Widely used in hybridizing as a source of vivid color. Often found as an epiphyte in rain forest, open areas, or hanging over precipices and streams from sea level to 6,500 ft. Indonesia, Papua New Guinea, Moluccas 80/150 BOS (+32). Long funnel-shaped flowers, yellow with orange lobes. 83/071 PS (+32). Collected wild in New Guinea.
11. februar 1999
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