Go to species: l m n o p kaempferi Tsutsusi (Azalea) Upright or somewhat wide-spreading deciduous to semi-evergreen shrubs. The beautiful funnel-shaped flowers (late spring to early summer) are shades of red to pink or white, and may have purple or crimson flecks. A heat tolerant and free-blooming azalea. Native to Japan where it is widespread and often abundant in a wide variety of habitats from sea level to around 4,000 ft. 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' BERG ((5\R1\4). Amazing "multi-petaled" carmine flowers for a "spidery" appearance. Very floriferous. 81/097 HLL (-10). Small open flowers, white in the throat and reddish pink at the margin. 86/010 HSZ (-10). Double flowered form. 324sd1999 K&Y#389:RSBG (- 5\R1\4). These are grown from seed collected wild at 1,600 ft. on Honshu, Japan. 329sd1999 kaempferi K&Y#411:RSBG (-5\R1\4). Semi-evergreen azalea with reddish to pink flowers in late spring to early summer. Heat tolerant and free-blooming, these are grown from seed collected wild at 3,400 ft. in Japan. 333sd1999 K&Y#429:RSBG (- 5\R1\4). These are grown from seed collected wild at 2,600 ft. on Honshu, Japan 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 A variable species, ranging from quite dwarf and compact to rather open and tall-growing. The leaves are lanceolate to narrowly elliptic in shape. The flowers (mid-spring) are yellow to pale yellow and widely funnel-shaped. A floriferous and easily grown hardy species. Native from central Japan south to Yakushima. Occurs in various well-drained habitats and as an epiphyte from 2,000 to 6,000 ft. 74/014 'Yaku Fairy' Berg (- 10\R1\1 foot across). This famous 1970 Award of Merit form of var. ozawae is a dense and prostrate mound with yellow flowers. A choice rock garden. 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) kesangiae Grandia Large upright evergreen shrubs eventually forming small trees. This is a recently described (1989) new big-leaf species which is still quite rare in cultivation here in North America. The large and attractive elliptic leaves are a foot or more in length with a woolly to somewhat plastered whitish to fawn indumentum on the lower surface. The magnificent flowers (mid-spring) are rose to pink with darker nectar pouches. These are borne in a large rounded and compact inflorescence (see cover jacket of The Larger Rhododendron Species by Peter Cox, Timber Press, 1990 Edition). An interesting species known only from the eastern Himalayan kingdom of Bhutan (so far) where it grows in forests from 9,500 to 11,500 ft. This is proving to be an easily grown and probably quite hardy new big-leaf species with very attractively-colored flowers. Best in light shade with protection from strong wind as the petioles break easily. 92/041 BB#8826:Berg (0\R1\4). This clone grown from seed collected wild by Warren Berg at 11,600 ft. on the Thrumseng La in Bhutan. keysii Cinnabarina Large upright and vigorous evergreen shrubs, similar in habit to the much more widely grown R. cinnabarinum. The narrowly elliptic leaves are densely scaly on the lower surface. This species has some of the most unusual and distinct flowers in the genus. They are narrowly tubular in shape, hanging in dense clusters from terminal and axillary buds at the tops of the branches in late spring to mid-summer. The flowers are usually bicolored with various shades of red or orange on the tubes and yellow or green lobes. Some forms have solid red or even yellow flowers. An exciting, rarely seen species, not really what one would consider spectacular but valuable for its extremely unusual flowers and late blooming time. Said to be susceptible to powdery mildew but we have had no problems here at the RSBG. Native to the eastern Himalayas where it occurs in various habitats from 8,000 to 12,000 ft. 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. 79/061 kiusianum 'Ukon' USNA (-5\R1\2). As above but with early single light pink flowers. 79/070 'Murasaki Shikubu' USNA (- 5\R1\18 inches). Hose-in-hose reddish purple flowers. Evergreen foliage in a mild climate or winter 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) Large tropical evergreen shrubs or small trees with dark green elliptic leaves. The whole plant is covered with orange-brown scales. The large fragrant flowers are pure white to white flushed pink or pink. Native to New Guinea where it is epiphytic in rain forest or terrestrial in Nothofagus and oak forests or swamps from 2,500 to 8,200 ft 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. 83/065 Schick (+32\R2\4). Beautiful and fragrant white flushed rose flowers. konori var. phaeopeplum Phaeovireya Similar to var. konori but smaller in all of it's parts and so better suited to growing in containers. 78/094 MOSS (+32\R2\?). Large fragrant white flowers flushed rose on the lobes with a yellow throat. 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') lacteum Taliensia Upright and stout-branched large evergreen shrubs or small trees. The leaves have a thin brownish indumentum on the lower surface. The pale yellow to yellow flowers (mid-spring) are in a large round inflorescence and often have a large reddish blotch in the throat. One of the most popular and highly sought after species with beautiful flowers and attractive foliage. Rarely available, it is rather slow-growing and difficult in cultivation, requiring shade from the hot after no sun and a cool, acidic and extremely well- drained soil. Native to west-central & NE Yunnan, China where it occurs in various montane habitats from 10,000 to 13,000 ft. 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. 141sd1995 RSBG ('5\R3\2-3). Seedlings from a controlled pollination cross here at the RSBG between 1975/125 (RBGE form w/ pale yellow flowers and a small blotch) x 1976/101 (yellow w/ a faint blotch). 143sd95 RSBG ((5\R3\2-3). Seedlings from a hand-pollinated cross here at the RSBG. These are nice-looking plants from 75/125 (RBGE form- pale yellow with a small carmine blotch) x 64/141 (Corsock form - pale yellow with crimson spots). $ 486sd1997 BH#150:Berg ('5\R3\2-3). Nice large seedlings grown from seed collected wild in NW Yunnan, China. Rarely offered wild-collected lacteum! A real opportunity for the collector. 503sd1998 CCHH#8238:RSBG (- 5\R3\2-3). These are seedlings grown from my collection of seed at 12,150 ft. on the CangShan 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 78/088 STRY:MOSS (+32\R2\?). "Strybing's best" form, with chrome-yellow flowers. 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. ledebourii = R. dauricum 1999/535 ledebourii JJH#9410111:RSBG (-25\R1\4). Fully evergreen relative of R. dauricum with glossy green foliage turning purple in winter. This clone with pure white flowers in early spring. Floriferous, tough and hardy. 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) Small tropical evergreen shrubs with young stems and ovate leaves densely covered by brown scales. The deep pink to salmon or carmine flowers are tubular and covered with brownish scales on the outer surface. Native to E Papua New Guinea where it grows as an epiphyte or on rocks and cliffs from 4,200 to 7,500 ft. 85/043 TT-DC (+32) 87/042 RBGE (+32\R1\?). Rose flowers with golden brown scales on this clone collected wild by Michael Black (#75). leptocladon Maddenia Our first offering of this exciting new introduction. This species forms an upright to fairly compact growing evergreen shrub. The large funnel-shaped flowers are quite distinct in being bright greenish-yellow fading to rich pale yellow with age. This is another introduction from Keith Rushforth who collected the seed in the Lao Cai Province of Vietnam where it grew on cliffs at around 6,500 ft. Quite easy to cultivate if provided with excellent drainage. Some reports of relative hardiness from the United Kingdom. 96/072 KR#2932:Millais (+10 to +5'\R2\5). Fantastic new species with very unusually colored flowers. Quite striking. NOTE: We have several similar clones accessioned from this same seed collection and you may receive any one of these as demand and supplies warrant. The relevant RSF accession # will be provided with your plant(s). 96/070 leptocladon KR#2932:Millais (+10 to +5?\R2\5). A newly introduced maddenia with bright greenish-yellow flowers fading to a rich pale yellow with age. Quite different from anything else and very attractive. From the Lao Cai Province of Vietnam where it occurs on cliffs around 6,500 ft. 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 Leggy, open-growing evergreen shrubs with attractive exfoliating reddish-brown bark. The large and fragrant, openly funnel-bell- shaped flowers appear in mid to late spring. They are an incredible pure white or white flushed with pink, often with an orange or yellow stain at the base. A fantastic species in flower and rated by many as one of the most beautiful flowers in the genus. Requires extremely well-drained soil. Not fully hardy in the Seattle area but worth attempting in a sheltered position. Also good in containers but can be a bit straggly so frequent pinching for the first couple of years is recommended. Occurs as an epiphyte or on cliffs in the eastern Himalayas from 6,000 to 11,000 ft. Perhaps my favorite species, definitely in the top three. 78/067 L&S 6562 - Cox - WEB (+15). The hardy form of this very fragrant large white flowered Himalayan native. 84/060 'Geordie Sherriff' Brodick (+5\R2\5). This is a fantastic selection from Grothausii Group. This clone with beautiful white flowers strongly flushed with deep rose won the Award of Merit in 1969. 520sd1997 SEH#534:RSBG (+15\R2\5). Grown from my collection of seed at 8,900 ft. in the Sikkim Himalaya. I collected this seed from plants in full bloom with large pure crystalline white flowers. Cutting-grown from the original seedlings. Fantastic! 227sd1997 RSBG (+5\R2\5). These are seedlings grown from seed produced from a controlled-pollinated cross here at the RSBG. These are the famous Grothausii Group which is hardier but has smaller flowers. The plant used for the cross is the AM form 'Geordie Sherriff'' (our 1984/060 selfed). These should have pink flushed flowers. lochiae Euvireya (Vireya) Mounding tropical evergreen shrubs with dark glossy green obovate leaves. The flowers are bright scarlet to red and tubular-funnel in shape. An easily -grown, floriferous and interesting species that occurs further south than any other and is one of only two species native to Australia (NE Queensland). Found in open bushland and on rocks from 3,000 to 4,400 ft. 78/096 DT-FM (+32). Form with pure scarlet flowers. 79/029 STAN (+32\R1\?). Red 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) longipes Argyrophylla New species to cultivation. Upright and bushy evergreen shrubs with long and narrow lanceolate leaves. The lower surface of the leaves is covered with a thin pale brown indumentum. The flowers (mid-spring') are pale pink to rose or purplish and may have spots. This is an exciting new introduction which is quite floriferous and beautiful as seen in Chinese manuals. It should be as excellent a performer in the garden as the other members of this subsection have proven to be over the years. Native to forests and cliffs from 4,500 to 9,000(') ft. in China (S Sichuan, NE Yunnan;N Guizhou). 457sd1996 SEH#119:RSBG (0\R1\5). My own collection from around 9,000 ft. in S Sichuan, China. longistylum Tephropepela An erect-growing but small evergreen shrub which tends to sprawl about a bit. Peeling brown bark and deep green shiny leaves somewhat similar to the closely related hanceanum. The white, narrowly funnel- shaped flowers (mid-spring) appear in small clusters and have a long style and stamens protruding beyond the flower. Very rare in cultivation but quite attractive in a subdued fashion. Found only in W Sichuan, China where it occurs in various habitats from 3,000 to 7,500 ft. Rarely offered. 79/049 GLE (+5). White flowers. loranthiflorum Solenovireya (Vireya) Densely-branched tropical evergreen shrubs with obovate smooth green leaves in pseudowhorls. The foliage is more or less covered with scales on the undersurface. The fragrant flowers are white with a long tubular corolla and abruptly flared lobes (salverform). Grows as an epiphyte in mountainous rain forests from 600 to 3,300 ft. on the South Solomon Islands of South Solomon and Papua New Guinea (Bismarck Archipelago and North Solomon Islands). 83/058 SCHI (+32\R1\?). 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 Upright evergreen shrubs with reddish new growth. The lanceolate leaves have a long acuminate 'drip-tip' which is quite distinctive. The widely funnel-shaped flowers (late winter to early spring) are pale to primrose yellow with green spots. A lovely species with early yellow flowers (very rare in the garden!) and attractive foliage. Easily grown and floriferous. Native to China (W Sichuan, NE Yunnan, Guizhou & Hubei) where it occurs in thickets, forests and along streams from 1,750 to 10,500 ft. 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. 352sd96 SEH#002:RSBG (+5\R1\6). My own collection from 9,600 ft. in S Sichuan, China. Beautiful bright and glossy reddish purple new growth on these vigorous seedlings. 424sd96 SEH#076:RSBG (0?\R1\6). Grown from seed collected wild at around 9,000 ft. in S Sichuan. Beautiful bright reddish purple new growth on these vigorous seedlings. 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. 76/432 'Golden Comet' RSBG (- 20\R1\4). The first named clone introduced by the RSBG. This is a spectacular plant with a stunning long-lasting inflorescence of fragrant deep yellow flowers. A deciduous azalea, this clone has colorful fall foliage of bright scarlet. This is the first of our R. luteum clones to color in the autumn and the last to drop its leaves, often remaining attractive into late November. With a great growth habit of horizontally held branches and good resistance to powdery mildew, 'Golden Comet' is a plant for any and all gardens. This selection was grown from seed collected wild in Turkey. Tolerant of full sun but best in partial shade and quite lovely in the woodland garden. 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. 96/060 KR#2962:Millais (+15\R2\5). This new collection by Keith Rushforth in Vietnam seems to be more upright in growth than the old Thailand collections previously cultivated. Our first offering. 1998/010 lyi KR#:Glendoick (+15\R2\5). Large and vigorous maddenia with large funnel-shaped white flowers. Collected by Keith Rushforth in Vietnam. Requires excellent drainage, should be quite heat resistant. macabeanum Grandia Large upright evergreen shrubs or trees to 45 ft. A big-leafed species with leaves up to 12 or even 18 inches long, shiny green on top with a woolly white to pale brown indumentum below. The flowers (early to late spring) are yellow or yellowish-white with a purple blotch in a huge, magnificent inflorescence. One of the more common, hardy and easy to cultivate members of it's subsection. Native to NE India (Manipur and Nagaland) where it occurs in mixed woodlands or forms pure stands from 8,000 to 10,000 ft. 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. 117sd93 RSBG (+5\R1\6). Seedlings from a hand-pollinated cross here at the RSBG. Our 76/308 (the famous "Trewithen form" - with lemon-yellow flowers and maroon nectaries) selfed. macgregoriae Euvireya (Vireya) Large tropical evergreen shrubs or small trees with ovate-lanceolate leaves in pseudowhorls. The leaves are smooth on the upper surface and more or less scaly beneath. The tubular flowers are light yellow to orange, pink or red, often with a yellow tube and orange lobes. Easily grown and floriferous, this is one of the best vireyas for the beginner. A common species throughout New Guinea where it occurs in a wide variety of habitats from 1,600 to 10,800 ft. 79/032 Pratt (+32\R1\?). 85/016 USDA 354381 (+32\R1\?) 85/021 USDA#354330 (+32\R1\?). Deep saffron-yellow flowers flushed apricot on the lobes. 85/026 USDA 354329 (+32\R1\?). Form with pale apricot flowers. 95/067 Woods#2646:Glendoick (+32\R1\4). Deep saffron-yellow flowers on this superb selection collected wild in New Guinea macrogemmum Tsutsusi (Azalea) Medium sized shrubs. Flowers purple. Native to Japan. 77/642 WEB. macrophyllum Pontica Large upright to rounded evergreen shrubs. The flowers (late spring to early summer) are pale to deep pink or rose-purple, magenta or white, typically with green, yellow or reddish flecks. An attractive and widespread species, well adapted to drought conditions and tolerant of heat and even salt spray. Inhabits the climatic zone with a relatively dry growing season but abundant winter moisture found along the western coast of North America from S British Columbia, Canada to California, USA. It occurs in forests and on open slopes from sea level to 4,000 ft. 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. 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' SMI.B ((5\R2\6). A clone with deep maroon flowers which was collected wild in Oregon. 85/051 B. Magnus - B. Smith. (-5). White flowered form. 85/053 ('Jim Blackford Form') J. Blackford - B. Smith (-5) 188sd96 95RP#007:RSBG (- 5\R2\6). Grown from seed collected wild by Rick Peterson from the Mineral Creek population in the Washington Cascades. NOTE: Comparable plants from other RP# collections made in this same area will be substituted if necessary. 186sd95 RSBG (- 5\R2\6). Grown from seed collected wild at Rhododendron Lake, BC, Canada; the most northern population of this species known to exist. 330sd95 95ARS#395:RSBG ((5\R2\6). Grown from seed collected wild from a plant (RB#87-5) having pink flowers with red spots deep in the throat. 181sd96 95RP#012"RSBG ((5\R2\6). Grown from seed collected wild from the Mineral Creek population in the Washington Cascades. 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 Large open-growing (sometimes more compact) evergreen shrubs. An extremely variable and widespread species now divided into two intergrading subspecies (ssp. maddenii & ssp. crassum) which are both comprised of several former "species". The large fragrant flowers (late spring to early summer) are quite variable in size and color but typically white or white flushed various colors, cream, pinkish or rarely yellow. A beautiful and easily grown species with good heat tolerance and relative hardiness in certain forms. Requires excellent drainage. Native to a wide variety of habitats from 5,000 to 12,000 ft. in China (Yunnan & SE Tibet), Upper Burma, NE India and 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 LAM (+10?\R2\8). Fragrant white flushed yellow flowers. maddenii ssp. maddenii Maddenia Large and open-growing (sometimes more compact) evergreen shrubs. An extremely variable and widespread species. The large funnel- shaped fragrant flowers (late spring to early summer) are quite variable in size and color, ranging from cream to pinkish or rarely yellow but typically white or white flushed various colors. A beautiful and easily grown species with good heat tolerance and relative hardiness in certain forms. Requires excellent drainage. Native to a wide variety of habitats from 5,000 to 12,000 ft. in N India (W Arunachal Pradesh & Sikkim), Bhutan and SE Tibet. One of my personal favorites which I grow in containers, these can be brought indoors when blooming to enjoy the magnificent fragrant flowers. 79/014 PIE (+15\R2\8). Fragrant white flushed pink flowers. This clone grown from seed collected wild in Sikkim. 80/130 (brachysiphon) TRG (+25) 94/001 Enjoy (+15\R2\8). A form from Paul Molinari in California known as the 'Jack Evans form'. Our first offering of this spectacular selection with sumptuous large white flowers. Probably our best clone. Simply fantastic! 585sd1997 SEH#599:RSBG (+15\R2\8). Grown from my collection of seed at 5,550 ft. in the Sikkim Himalaya from plants with large white flushed pink flowers. Rarely available wild source maddeni makinoi Pontica Rounded evergreen shrubs with extremely narrow leaves several inches in length but typically less than one inch in width. The foliage is similar to that of the closely related R. yakushimanum (except in shape) but emerges much later in the season. The pink to white flowers appear in early summer about a month later than those of a "yak". A distinct and ornamental plant for it's wonderfully indumented and unusually shaped linear leaves. Best in light shade and tolerant of limestone soils. Native to a small area of C Honshu, Japan where it grows in forests from 600 to 2,300 ft. 73/173 JHC: PHB (0) 76/047 (makinoi) JHC (-15). 84/152 (makinoi) HLL (-15). Form with pink flowers. 293sd95 95ARS#399:RSBG ((15\R2\3). Grown from seed collected wild on Mt. Horaiji, Japan. Amazingly beautiful and long leaves on these plants. 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. #9809 mallotum Sinclair (+5\R1\4). Rarely offered species with red flowers in early spring. One of the most spectacular species for foliage with large obovate leaves to eight inches in length. The upper surface is rugose and the lower is covered with a woolly cinnamon-brown indumentum. These are large plants grown by June Sinclair from seed produced by crossing two good garden forms. Our first offering in many years. 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 Large evergreen shrubs or small trees blooming in mid-summer with white flushed pink to rose-purple or rarely pure white flowers, usually with greenish flecks. The leaves can be up to one foot in length and are covered with an attractive whitish indumentum when they first emerge. Quite cold and heat resistant and tolerant of extremely heavy shade. Occurs in deciduous or coniferous woodlands from 1,000 to 5,500 ft. A common species from the province of Nova Scotia, Canada south to the states of Georgia and Alabama, 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. 301sd1995 95ARS#404:RSBG ('25\R1\6). Grown from seed collected wild in Clay Co., N.C. from a 'red-flowered form'. 308sd95 95ARS#405:RSBG ((25\R1\6). Grown from seed collected wild at 3,500 ft. on Mt. Mitchell, N.C. from a "red form". 318sd95 95ARS#410:RSBG ((25\R1\6). Grown from seed collected wild at 2,900 ft. on Bent Mountain, Georgia from a plant with white flowers and extremely blue-green foliage. 577sd96 96ARS#335:RSBG ((25\R1\6). Grown from seed collected wild on Bent Mountain, Georgia from a plant with blush flowers in multiple terminal buds. 98/708 RING ((25\R1\6). A selection from the wild by George Ring of a "multi-bud form" with many more pale pink flowers than normal on this species. A very limited supply of grafted plants of this special selection. 168sd1999 SEH#1015:RSBG ('25\R1\6). Grown from my collection of seed in the mountains of W North Carolina from a population (4,850 ft.) with a good dark indumentum. 173sd1999 SEH#1020:RSBG ('25\R1\6). As above but from the highest population located (5,500 ft.). 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 Compact and densely-branched dwarf evergreen shrubs with hairy petioles and young shoots. The tiny (usually less than one inch) elliptic to rounded leaves of this species are quite attractive with hairy margins and a glaucous-white underside. The flatly bell-shaped flowers (early spring) are yellow to cream or whitish with a yellow blotch. One of the finest of the dwarf species when grown well, requiring exceptional drainage. A favorite which I find quite happy in a container for close-up viewing of the attractive foliage and flowers. Native to high rainfall areas of SE Tibet, Arunachal Pradesh, Upper Burma & NW Yunnan, China where it occurs from 8,000 to 13,500 ft. as an epiphyte and on mossy cliffs, old stumps and logs. 65/261 Bodnant (+5\R2\1). The famous 'Bodnant form'. The deep glossy green, tiny rounded leaves have a fringe of long hairs on the margin. Dark yellow flowers on this smaller-growing clone which is one of my favorite all-time plants. 73/178 WW: CS (+15) 82/158 BIR (0?\R2\2). Beautiful blue-green leaves fringed with long hairs. mekongense var. mekongense Trichoclada Upright to rounded deciduous shrubs usually under six feet high. The small obovate and thinly textured leaves are smooth on the upper surface but bristly on the lower. The foliage often turns to shades of yellow in the autumn before dropping. The yellow to greenish yellow flowers (mid-spring to early summer) are funnel- bell-shaped. This species and its close relatives are unusual in that they are actual deciduous rhododendrons and not 'azaleas'. Good in full sun or partial shade. Native over a wide range from the eastern Himalayas to central Yunnan, China. Occurs in a wide variety of habitats from9,000 to 14,500 ft. 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. 441sd1998 CCHH#8170:RSBG (0\R1\3). Grown from my collection of seed at 11,800 ft. on the Salween/Irrawaddy divide in NW Yunnan, China. The margins of the rounded leaves have a fringe of long hairs. 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 Large vigorous evergreen shrubs. The flowers (late spring to early summer) are milky-white in a many-flowered inflorescence resembling that of a Ledum. A very distinct species, free- flowering and hardy. Native to China and Korea where it occurs in a wide range of habitats at elevations ranging from 5,200 to 10,500 ft. Hardy to (20 and possibly lower. 76/399 PTG (-20) 90sd003 Seedlings (grown from seed collected in Korea and sent to us by the Korea Botanic Garden 481sd95 BJG#067:RSBG ((25?\R1\4). Grown from seed wild collected on an expedition led by the U.S. National Arboretum. microgynum Neriiflora Compact evergreen shrubs with splendid pale rose to deep crimson flowers in mid-spring. The leaves are dark green with heavily-impressed veins above and a dense cinnamon to buff indumentum beneath. This species blooms at an earlier age and is usually easier in cultivation than most of its relatives in subsection Neriiflora. An attractive species at its best in partial shade. Native to China (NW Yunnan and SE Tibet) where it grows in open pine forests, bamboo groves, and on boulder strewn slopes from 12,000 to 14,000 ft. 68/212 (syn. gymnocarpum) EXB: PHB: JH: MVW (5 or (10?\R1\3). Deep crimson flowers and leathery foliage with a dense indumentum. AM 1940 74/027 ('gymnocarpum') F#14242:Windsor ('5\R1\3). Blood-red flowers. 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 Open-growing, occasionally upright but more typically sprawling and stoloniferous evergreen shrubs. The leaves are elliptic to rounded in shape and bullate ('puckered') on the upper surface. The flowers are pink to rose in mid-spring. Quite heat and drought tolerant but requiring exceptional drainage in cultivation. A very rare and unusual species native to sand dunes and open pine woodlands in Florida, USA. 76/016 Cline (0'\R2\2). Dense bright green foliage and a sprawling but attractive habit on this clone. Almost like a groundcover. 82/187 (chapmanii) NCSU (0?\R2\2). Form with pink flowers, collected in Gulf CO. FL 82/189 (chapmanii) NCSU (0). Wild collected in Clay County, Florida 310sd95 95ARS#259:RSBG (0?\R2\2). Grown from seed collected wild in Gulf Co., Florida. 82/191 (chapmanii) NCSU (0) Wild collected in Gulf Co. FL minus var. minus Caroliniana Compact and rounded to upright evergreen shrubs. The funnel-shaped flowers (mid- to late spring) are pink to purplish or white. An extremely variable species in terms of growth habit, size and flower shape. Probably most famous as one of the parents of the famous 'PJM' grex of hardy lepidote hybrids. Valuable for its cold and heat tolerance. Native to a wide variety of habitats in 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 582sd1996 96ARS#345:RSBG ('15\R1\6'). Grown from seed collected wild at 1,000 ft. in Fulton Co., Georgia. 167sd1999 (Carolinianum Group) SEH#1014:RSBG ('15\R1\4). Grown from my collection of seed at 4,850 ft. in the southern Appalachians of western North Carolina. molle ssp. japonica Pentanthera (Azalea) Upright deciduous shrubs with colorful and often fragrant flowers in mid-spring. The large brightly colored blossoms range in color from orange, orange-red, red, scarlet and pink to deep yellow. A reasonably heat and cold tolerant species with beautifully colored fall foliage. One of the finest of the deciduous azaleas with remarkably colored and attractive flowers. Native and common over a wide area of Japan in various habitats and elevations. 77/035 (japonicum) GRA ((15). Vermillion flowers with gold flecks in this clone. 80/091 R 11316 (USDA 59226): RBG (0). Light orange flowers. 81/030 (japonicum) USNA#45358:USNA ((15). Orange flowers with darker flecks. Grown from seed collected in Seidagawa, Kusumachi, Fukuoka Prefecture, Japan. 231sd97 RSBG ((25?\R1\4). Seedlings from a hand-pollinated cross here at the RSBG. Nice large bushy plants from 77/035 (saffron yellow) x 81/032 (USNA#45358, w.c. in Japan - salmon-pink flushed apricot). 311sd1999 molle ssp. japonicum YK#1287:RSBG (-15\R1\4). Fantastic deciduous azalea with large brightly colored flowers (mid-spring) in shades of orange to yellowish or salmon. Great fall foliage color. These are grown from seed collected wild at 4,600 ft. in Japan. An easy and floriferous species tolerant of a wide range of conditions. 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 dry hillsides and forest margins at 10,000 to 12,500 ft. China 76/295 HLS (+10). Pink flowered form. monanthum Monantha An exciting new dwarf species to cultivation! This is an epiphytic, yellow-flowered lepidote which amazingly blooms in the autumn. Quite distinct with a dwarf habit and glossy, gray-green obovate leaves around one inch in length. The small tubular bell-shaped flowers are deep yellow. Interestingly, this species, long known to taxonomists and extremely common in the mountains along the Yunnan/Burma border, was never introduced by the early plant hunters. As an epiphyte, this species requires exceptionally well-drained soil. Great in containers or hanging baskets in areas with colder winters. Native to the N Burma/W Yunnan border and adjacent areas of SE Tibet. Occurs in trees, and on old logs and cliffs from 8,000 to 12,000 ft. 411sd1998 CCHH#8133:RSBG (0 to +5\R2\1). Grown from my collection of seed at 8,500 ft. near the Burma border in extreme NW Yunnan, China. A real collector's item and a very attractive little species. Completely new and unrelated to anything. 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' 127sd2000 montroseanum RSBG (+10 to +5\R1\6). These are seedlings grown from a controlled selfing of 1980/050 (KW#6261A). One of the hardier big-leaf species. Bright pink to purple-pink flowers in early spring. 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 Low-growing evergreen shrubs with attractive smooth and peeling reddish brown bark. The stiff ovate to elliptic leaves are shiny and two inches long with a bristly petiole. The large and beautiful, funnel- shaped flowers appear very early in the season and range in color from white or white flushed rose to deep pink, often with reddish spots. Red-bronze new growth adds additional appeal to this exquisite species. Requires very well-drained soil but quite drought tolerant once well- established. A personal favorite and one of the highlights of early spring here at the RSBG. Native to SW China (C Sichuan to NE Yunnan & Guizhou) where it occurs as an epiphyte or on cliffs from 6,500 to 10,800 ft. 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 W#879:Glendoick (+5\R2\3). Large white flowers with red flecks, one of the earliest clones to bloom in the garden. Very nice. 99/041 Sinclair (+5\R2\3). This clone with deep pink flowers was selected from a batch of seedlings (93ARS#249) grown by June Sinclair. AC#1157 (+5\R2\3). These are cutting-grown from our original seedlings of this unusual new collection. The leaves are smaller and more rounded than on other forms I have seen. They are also quite hairy. Nice white flushed rose flowers and a rather prostrate habit so far. Very distinct new introduction of this well-known species mucronulatum Rhodorastra Upright deciduous shrubs with pink to rose, red-purple, or white flowers in late winter to mid-spring. A cold and heat tolerant species grown for its typically early blooming season and bright fall foliage color. Excellent in the woodland garden but also tolerant of much more exposed sites. Found on dry stony slopes and forest margins from 1,000 to 5,500 ft. Native over a wide area of E Asia from Siberia to Mongolia, China, Korea and Japan. 73/193 'Cornell Pink' TIC-PHB (15\R1\6). 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 Berg (15\R1\2). Rose-purple flowers on this dwarf compact form. 77/661 'Winter Brightness' Windsor ('15\R1\6). Rich purplish rose flowers in late winter to early spring on this 1957 FCC clone. 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\R1\6). Typical upright shrub form but with subdued watermelon red flowers. 82/205 Suzuki:Berg ('15\R1\6). This is our first offering of these Japanese selections featuring semi-double flowers. We have small numbers of several clones under different accession numbers which will be substituted as dictated by demand. All are similar with red-purple flowers.Very attractive and floriferous. 85/060 NA 55065-USNA (-15). From wild collections in Korea on sunny hillsides. 87/023 Berg ('15\R1\6). A clone we received from Warren Berg as one of his 'best colored forms' with bright red-purple flowers. 98/738 ('forma albiflorum') USNA ('15\R1\6). This is our first offering of this pure white, large-flowered clone. Stunning. 238sd96 ("var. ciliatum") YK#1029:RSBG ((15\R1\6). Grown from seed collected wild at 1,575 ft. from Mt. Shiradake, Tsushima Island, Nagasaki Prefecture, Kyushu, Japan. Nice large plants. 172sd1998 HC#970291:RSBG ('15\R1\3'). Grown from seed collected wild (as 'var. ciliatum') by Dan Hinkley on Cheju Island, Korea at 4,840 ft. from compact plants with 'good fall color'. These are fairly vigorous seedlings which should become a bit more compact when planted in the garden as I am assuming they are var. taquetii (syn: var. chejuense) the 'dwarf form' of this species which occurs on this island. 183sd1998 ('var. ciliatum') HC#970406:RSBG ('15\R1\6). Grown from seed collected wild by Dan Hinkley and Darrel Probst in Korea from plants growing between 4,000 and 4,800 ft. in elevation. 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. nakaharae Tsutsusi (Azalea) Prostrate creeping evergreen shrubs with brick-red to rose-red or scarlet flowers in early to mid-summer. The attractive glossy and rounded leaves have scattered long red-brown hairs. This popular and hardy azalea with its uniquely-colored flowers is ideal for extending the blooming season. An excellent groundcover in sun or light shade, often used in hybridizing programs or bonsai. Found in open grasslands and on sandstone rocks from 1,000 to 3,300 ft. on the island of 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 A variable species ranging from compact and rounded evergreen shrubs to small trees. Attractive smooth and peeling, pale brown to tannish or red-brown bark. The leaves are smooth with a glaucous white covering on the underside in most forms. The tubular bell- shaped flowers (mid-spring) are typically bright red with a thick and lustrous, waxy appearance. A very free-blooming and easily grown species. Native over a wide area of W Yunnan and N Burma where it occurs in various habitats from 7,000 to 11,000 ft. 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) 488sd1998 CCHH#8220:RSBG (0\R1\4). Grown from my collection of seed at 10,600 ft. on the Cang Shan of W Yunnan. neriiflorum ssp. phaedropum Neriiflora This differs from subspecies neriiflorum in the longer and more narrow leaves as well as in bearing glands on the ovary, calyx and pedicel (ssp. neriiflorum lacks these glands). This subspecies is native primarily to the west of ssp. neriiflorum occurring from NW Yunnan west into N Burma, NE India (Arunachal Pradesh), SE Tibet and central Bhutan. It is found in mountain forests from 6,500 to 11,000 ft. Quite rare in cultivation. 404sd1998 CCHH#8125:RSBG (+5\R1\4). Grown from my collection of seed at 8,750 ft. near the border with Burma in NW Yunnan. 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 Compact rounded evergreen shrubs with densely white felted branchlets. The attractive foliage emerges silvery white or tannish and this is retained as a dense woolly grayish to tan indumentum on the lower surface. The amazing flowers (mid-spring) are unlike those of any other species. They are borne in a dense and compact, rounded inflorescence and are typically colored a shade of purple which has been described as similar to 'grape Kool-Aid'. One of the 'classics' in the genus with stunning foliage and flowers. Best in light shade. One of the rarest species in the wild. Found only in a few isolated populations in the eastern Himalayas (Sikkim & Bhutan). In forests and on slopes from 10,000 to 12,000 ft. 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. 553sd1997 SEH#567:RSBG (0\R1\3). My own collection from 10,000 ft. in the Sikkim Himalaya. A limited supply of this rarely offered species. The real thing. 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. nudipes alliance Brachycalyx Upright deciduous shrubs (or small trees in the wild) with rhombic- shaped leaves in whorls of three at the ends of the branches. The flowers (early to mid-spring) are rose-purple and quite attractive. Typically with good fall foliage color. These are good azaleas for the woodland garden in warmer climates but do better with a little more sun(heat) in cooler climates. These are seedlings grown from seed collected wild as R. lagopus var. niphophilum, a taxon closely related to the widespread species R. nudipes and hardly distinguishable from it. I have chosen to accession them as "nudipes alliance" as there is a great deal of confusion over the taxonomy and nomenclature of this group of plants at the current time. This is our first introduction of this taxon. Native to Japan from Honshu south. 252sd96 YK#0987:RSBG ((10?\R1\4). Grown from seed collected wild as R. lagopus var. niphophilum at 220 ft. on Oki Island, Shimane Prefecture, Honshu. 255sd96 YK#0999:RSBG ((5 to (10?\R1\4). Grown from seed collected wild as R. lagopus var. niphophilum at 500 ft. on Oki Island, Shimane Prefecture, Honshu. nuttallii Maddenia Large, leggy evergreen shrubs or small trees with beautiful smooth and peeling reddish brown bark. The new growth is typically silvery red or purple. The impressive large leaves are elliptic in shape with a deeply bullate upper surface. Both surfaces are densely scaly. It is argued that the flowers of this species are the most magnificent in the genus. They are funnel-bell-shaped and up to six inches long and wide. These fragrant flowers (early to mid-spring) are white, often flushed pink and with a yellow blotch in the throat. One of the most spectacular plants in the genus (actually the entire plant world), this species has everything - except hardiness. Limited to greenhouse or container culture in all but the mildest climates. Requires excellent drainage and frequent pinching as a young plant. Common and widespread in the wild. Native from the extreme eastern Himalayas to W Yunnan, China (and into N Vietnam'). Occurs primarily as an epiphyte or on cliffs from 3,500 to 12,000 ft. 80/155 ('sinonuttallii') UBCBG (+25\R2\7). Typical white flushed pink flowers with a yellow blotch. 00/024 'John Paul Evans' Enjoy (+25\R2\7). This well-known clone was selected from the magnificent planting of this species in the garden of Mr. and Mrs. Evans, Oakland, California. Up to 12 large flowers per truss (typically less). Probably the best clone grown in California. 369sd1998 CCHH#8077:RSBG (+25\R2\7). Grown from my collection of seed at 6,550 ft. along the Yunnan/Burma border. Large rugose leaves and bright fuchsia-pink new growth set with silver scales. I was lucky enough to see these plants in full bloom in the spring of 2000 in the same region and the flowers were stupendous. Each fragrant flower was six inches long by six inches wide at the mouth. White flushed pink with a yellow throat. Outstanding. 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:MOSS ((10). Flowers late with some red and/or picotee in this clone collected in Humboldt County, 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. 81/116 SM#245:SMI.B ((10). 88/041 'Gualala Bronze' Schick ('10\R1\4). This clone with bronzy new growth was collected by Peter Schick in California. I have not recorded flower data on this clone 89/020 SM 28-2: FM (-10). Hose-in-hose corolla. 347sd1999 99ARS#395:RSBG ('10\R1\4). Grown from seed collected wild in Sonoma Co., CA. (as Bohemian#1901). 348sd1999 99ARS#393:RSBG ('10\R1\4). Grown from seed collected wild in Big Basin Redwoods State Park, Santa Cruz Co., CA. (as Big Basin#1701). 49sd1999 occidentale 99ARS#397:RSBG (-10\R1\4). Deciduous azaleas with large fragrant white flowers. These are marked or flushed with red, pink, orange or yellow. Grown from seed collected wild in Mendocino Co., CA. ochraceum Maculifera Perhaps the most exciting new introduction in years! This little- known and extremely rare species forms an upright evergreen shrub or a small tree. The narrowly oblanceolate leaves are covered with a pale orange-brown indumentum on the undersides. The petioles and young stems are bristly and the plant looks rather like a cross between R. strigillosum (with which it is closely related) and R. griersonianum (of course it is not this cross). The bell-shaped to funnel bell-shaped flowers are deep red with darker nectar pouches and are similar to the flowers of R. strigillosum. This species is considered by Chinese botanists to be one of the rarest rhododendrons in China, with only a few remnant populations in scattered isolated pockets of forest and steep limestone cliffs. This seed was collected from the same site in which we found the recently introduced R. huianum and R. asterochnoum. The R. ochraceum occurred as a small population of plants growing in a thick layer of moss on top of a giant limestone boulder in deep shade. Native to S Sichuan and NE Yunnan, China. 428sd96 SEH#080:RSBG (+5?\R2\4-5). A plant for the serious collector. Grown from seed collected wild at 9,500 ft. in S Sichuan, China. oldhamii Tsutsusi (Azalea) Upright to spreading shrubs with reddish glandular hairs densely covering the branchlets. This evergreen azalea also has long reddish hairs on the leaves for a very attractive and distinctive look. The flowers (mid- to late spring) are large and funnel-shaped, brick-red to coral-pink in color with spots. A very ornamental species with large leaves and flowers for this section. Should be heat tolerant but is not fully hardy even here at the RSBG (it has survived for the past several years however). Best in light shade but tolerant of sun. Native to Taiwan where it occurs from sea-level to 9,000 ft. 73/203 USDA 325036-USDA (+10). Stems and leaves covered with soft hairs, flowers bright brick-red. 93/051 Wada:Berg (+5\R1\4). A good form which blooms sporadically over a long season (almost year-round in Warren Berg's garden). Typical and distinctively colored rose-red-pinkish flowers (oldhamii 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 130sd2000 orbiculare ssp. orbiculare RSBG (-5\R1\3). An amazing species which forms a perfect rounded mound of large and smooth green round leaves with a heart-shaped base. Clusters of pink to rose, bell-shaped flowers in mid-spring. These are grown from a controlled cross- pollination here in the RSBG between 1966/542 (RBG Edinburgh) x 1967/702 (the AM form (1922) from Bodnant). Rarely offered due to difficulty of propagation. Best in light shade. 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 Large upright and wide-spreading evergreen shrubs or small trees. The flowers (early to mid-spring) are white or white flushed pink to rose, often with darker flecks. Beautiful and hardy, this is a very free-flowering and easily cultivated species. An excellent specimen plant and perfect for the woodland garden. Distinguished from var. oreodoxa by its glandular ovary. Native to China (NW Yunnan, Sichuan, Gansu, Shaanxi & Hubei) where it grows in forests from 7,000 to 13,500 ft. 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 WIND ((15?\R1\4). 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 Upright to rounded evergreen (occasionally semi-deciduous) shrubs typically with glaucous green or blue-green leaves. The beautiful widely funnel-shaped flowers (mid-spring) are white, pink, rose or purple, often with spots. An easily grown and free-flowering species with outstanding foliage and flowers in most cultivated forms. A common, widespread and variable species native to N Burma and China (SE Tibet, N Yunnan & Sichuan). It occurs in a wide variety of habitats from 9,000 to 14,000 ft. 66/625 F#20489:WIND ((10?\R1\6). White flushed rose-purple flowers ("pale mauve") with green-gold flecks. Blue-green leaves 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). pachypodum Maddenia Compact to open-growing evergreen shrubs with peeling reddish brown bark. The leaves are quite variable in shape with a dense layer of scales beneath. The large openly funnel-shaped flowers are white to white flushed pink or rose, typically with a yellow to brownish blotch and can be quite spectacular. This species is closely related to the well-known R. ciliicalyx and includes the former species scottianum & supranubium. Requires excellent drainage in cultivation. Native to Upper Burma and China (W Yunnan & Guangdong) where it occurs in various open and well- drained habitats from 6,000 to 12,000 ft. 87/055 F.007516 - RBG (+25) 257sd97 AC#1993:RSBG (+15?\R2\4). Grown from seed collected wild in China. pachysanthum Maculifera Compact rounded evergreen shrubs. The flowers (early to mid-spring) are white to pale pink, often with crimson or green flecks. One of the finest foliage plants in the genus. Indumentum color ranges from silver-white to a rich brown (when grown in shade) on the upper surface, rusty brown on the underside. A hardy and adaptable garden plant which should be in every collection. Found on exposed grassy ridges from 10,000 to 10,500 ft. on the island of Taiwan. 78/064 Patrick - WEB (0) 91/039 BERG (0). Selected seedling grown from Cox seed. 97/096 Zimmerman ('10\R1\3). These are cutting grown from a seedling grown from hand-pollinated seed produced by Peter Cox from his planting of the original John Patrick collection. 574sd1996 96ARS#212:RSBG ('10\R1\3). Grown from seed from a controlled pollination cross between two excellent clones in the garden of Mrs. June Sinclair. 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. 65/389 'Sesame' BOD:UBCP ((5). Flowers rose in bud opening to white flushed pink in this AM form (1963). 70/191 W#1435:LAM ((5). Pastel-rose flowers with a burgundy blotch 76/164 BOD (-5). Form with pink flowers. 78/064 PAT-WEB (-5) 175sd2000 DJHC#806:RSBG (-5\R1\5). Large shrubs closely related to the well known red-flowered R. strigillosum. This species differs in its more furry and less bristly stems and petioles and in its pink to white flowers. These are grown from seed collected wild in China by Dan Hinkley (as strigillosum) and appear to be what is known as "var. monosematum" which is an intermediate between the two species under discussion here. Probably with pink flowers in early spring. Rarely offered and very attractive plants. Best in light shade. parmulatum Neriiflora Upright growing rounded dwarfish evergreen shrubs. The attractive foliage is shiny with deeply impressed veins on the upper surface, smooth and somewhat glaucous on the lower. The tubular bell-shaped flowers (early to mid-spring) are remarkably variable in color, ranging from white to yellow, pink or red, often bicolored and usually spotted, often heavily. An extremely attractive plant in foliage and flower and one rarely seen in cultivation. Requires excellent drainage and light shade. Native only to the Pemako region of S Tibet where it occurs on rocks and cliffs and in other well-drained situations from 10,000 to 12,000 ft. 74/017 ROBB (0) 82/047 'Ocelot' TREM:UBCBG ((5\R1\3). Yellow-green flowers with a darker band on each lobe and heavy gray-purple spotting in the upper throat on this 1977 AM form. Rarely offered collector's plant. 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 A low-growing, mound-forming and often stoloniferous evergreen shrub. The funnel-shaped flowers (early spring) are pink to pale pink-purple and quite large compared with the glossy dark green foliage. A densely branched, floriferous and easily grown species. Native to a small area of SE Tibet and adjacent NE India (Arunachal Pradesh) where it occurs from 10,000 to 12,000 ft. on mossy rocks and steep open slopes. 70/042 Robbins (0\R1\2). Pastel rose-purple flowers. pendulum Edgeworthia Dwarf evergreen shrubs with a compact to rather open and upright habit. The branchlets and new growth are covered with a dense wooly indumentum. The small oblong-elliptic leaves are smooth on the upper surface and covered with a thick buff indumentum on the lower. The small openly funnel bell-shaped flowers are white to cream, often flushed with pink and with a reddish calyx. A strikingly handsome foliage plant that is unfortunately rather difficult to grow well. Best in a log or stump with plenty of moisture or in containers with an exceptionally well-drained media. Very choice dwarf species. Native in the eastern Himalayas from E Nepal to S Tibet and Bhutan. Occurs as an epiphyte or on cliffs and boulders from 7,500 to 12,000 ft. 76/141 LS&T 6660: RBG (+10). Form with white flowers. 93/053 BB#8831:Berg (0\R3\2). This clone grown from seed collected wild by Warren Berg at 11,600 ft. on the Ura La, Bhutan. 99/527 BB#8831:Berg (0\R3\2). Another clone from the seed collection mentioned above. I have not seen either clone in flower. 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) Large upright growing and graceful deciduous shrubs. The flowers (mid- to late spring) are pale to deep pink or white with dark purple tubes. A very hardy species with attractive leaf coloration in the fall and delicate, brightly-colored flowers which can light up the woodland garden. Many forms are sweetly fragrant like honeysuckle. Native to damp stream banks and dry, rocky wooded slopes up to 4,000 ft. in E USA. (syn. nudiflorum) 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. 101sd95 RSBG ((15?\R1\5). Grown from seed collected wild in Connecticut from a plant with large and flat, near white flowers. 114sd95 RSBG ((15?\R1\5). Grown from seed collected wild in Connecticut from a plant with pink flowers and twisted petals. 115sd95 RSBG ((15?\R1\5). Grown from seed collected wild in Connecticut from a plant with dark pink flowers. 117sd95 RSBG ((15?\R1\5). Grown from seed collected wild in Connecticut from a plant with dark pink flowers and a white blotch. 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). 363sd1997 phaeochrysum var. agglutinatum JN#586:RSBG (-15\R3\4). Compact shrubs with stout branches and very attractive foliage with fawn indumentum on the lower surface. White to pinkish flowers with spots. Grown from seed collected wild by Jens Nielsen at 12,500 ft. near Zhongdian, NW Yunnan, China. Nice large plants. phaeochrysum var. phaeochrysum Taliensia Compact evergreen shrubs to small trees with rough flaking bark. A common, widespread and incredibly variable species in the wild. The leaves have an attractive agglutinated to felted, pale brown to deep red-brown indumentum on the lower surface. The upper surface is generally a deep shiny green. The flowers (mid-spring) are white to pink and spotted. This is a species seldom seen under the correct name in cultivation. It can be difficult if not given a cool position with excellent drainage but makes an outstanding ornamental plant with age. Native to SW China (Sichuan, Yunnan & SE Tibet) where it occurs in a wide variety of habitats from 10,000 to 15,500 ft. One of the most common species in the wild. 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. 80/048 ('dryophyllum') F#21400:Borde Hill ('10\R3\4). This is now referable to var. phaeochrysum. 265sd1997 phaeochrysum AC#1772:RSBG (-15\R3\4). As above. This species is relatively tolerant of dry soils once established. Best in light shade or morning sun. Requires excellent drainage. From seed collected wild in China. 487sd1997 BH#033:RSBG ('10\R3\4). These are vigorous seedlings with beautiful foliage grown from seed collected wild in NW Yunnan Province, China. Probably referable to var. phaeochrysum. 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 Compact to rather open-growing, wide-spreading evergreen shrubs. The beautiful foliage is dark shiny green and heavily veined on the upper surface, covered with a thick and woolly orange-brown indumentum beneath. The tubular bell-shaped flowers (early to mid-spring) are crimson to scarlet. A spectacular plant, blooming well even in shade. Closely related to R. beanianum but usually much more attractive and easier to grow. Known only from one area of SE Tibet where it occurs from 12,000 to 13,000 ft. 76/210 RBG (+5\R1\3). Open trusses of pure scarlet flowers pictured on the cover of ARS Bulletin Fall 1976. pingianum Argyrophylla Rounded evergreen shrubs with white tomentose branches. The leaves have a white compacted indumentum on the lower surface. The flowers (mid-spring) are pink to pale purple in a somewhat flat-topped and loose truss which is none-the-less quite attractive. This species is closely related to argyrophyllum but is comparatively rare in cultivation. Should be quite hardy. Native to central Sichuan, China where it occurs in forests from 6,500 to 9,000 ft. 79/161 Hu#8199:UWA ('5\R1\4). Elegant rose flowers. 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 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 Upright growing evergreen shrubs with densely scaly branchlets. The narrow leaves are lanceolate to oblanceolate with a dark shiny green upper surface and a densely scaly lower. The widely funnel- shaped flowers (mid-spring) are pale to deep purple or rose-mauve and typically have some yellowish spotting. A rarely grown species which has been reintroduced recently. Common in a wide variety of habitats from 6,500 to 10,000 ft. in W Sichuan, China. 75/216 POR ((10?\R1\5). Red-purple buds open to rose-purple flowers. A collector's species. ponticum Pontica Large vigorous evergreen shrubs with smooth green leaves. The flowers (late spring to early summer) are purple, red-purple, lavender, pink, or mauve, rarely white flushed pink, often with yellow, green-yellow, or brown flecks. Found in mixed forests and thickets in wooded valleys from sea level to 6,000 ft. Native to Spain, Portugal, SE Bulgaria, N Turkey, SW Russia, Georgia, and Lebanon. 78/056 'Cheiranthifolium' PHET ((5\R1\8). Light purple flowers with unusually narrow strap-like leaves. 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 Large evergreen shrubs with a wide-spreading habit, often wider than tall but can become tree-like. The relatively large leaves complement the large and showy flowers in early spring. These are white to pink or rose with a prominent purplish blotch at the base. Similar and closely related to the well-known sutchuenense but with a blotched corolla and hairless lower leaf surface. Best in light shade and very hardy. Native to China (W Hubei & E Sichuan) where it occurs in forests from 5,250 to 8,250 ft. 82/008 BRO: LB (-10). Flowers pink with a purple blotch. 252sd1997 RSBG ('15\R1\4). A small supply of seedlings this year grown from hand-pollinated seed produced here in the garden (1966/563 (Windsor form) selfed). primuliflorum Pogonanthum Typically low-growing and compact evergreen shrubs but can be somewhat upright and leggy. The tiny fragrant leaves are densely covered with fawn to dark brown scales on the underside. The small tubular flowers are white to deep pink and arranged in daphne-like clusters. A widespread and extremely variable alpine species which makes a choice addition to the rock garden. Prefers full sun and is relatively drought tolerant once well-established. Common in a variety of montane and alpine habitats from 11,000 to 15,000 ft. in China (N Yunnan, S Tibet, N; W Sichuan Gansu'). 77/603 GLE:BERG ((5\R2\2). Beautiful rose-pink flowers, one of our finest forms. (primuliflorum var. cephalanthoides) 77/715 RBG (0). Form with pink flowers. 95/077 'Doker La' Glendoick ('10\R2\2). Beautiful deep rose flowers on this Award of Merit clone. principis Taliensia Large rounded evergreen shrubs or small trees. An attractive plant with a unique thick and spongy silvery white to fawn indumentum on the lower side of the leaves. The flowers (early spring) are white to white flushed pink to rose, often with darker spots. One of the largest and more easily grown members of this subsection. Found only in S Tibet where it is common in a variety of habitats from 9,000 to 15,000 ft. 65/282 (vellereum) BH (0). Form with light pink flowers in April and dense thick light butter colored indumentum. 473sd1999 CHC#8541:RSBG ('5\R1\4). Grown from my collection of seed at 13,000 ft. near the Sur La in SE Tibet. prinophyllum Pentanthera (Azalea) Large deciduous shrubs with brightly colored foliage in the autumn. The pale to deep pink flowers appear before or just with the leaves in early to mid-spring and are extremely fragrant. One of our finest native azaleas. Occurs in bogs and on open wooded slopes, bluffs and stream banks from 500 to 5,000 ft. Native in the NE USA south to North Carolina and west to Oklahoma. 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. 226sd1998 98ARS#557:RSBG ('25\R1\5). These are grown from seed collected wild in the Dolly Sods of West Virginia. This population contains the finest forms of this species with the largest flowers that I have seen in the wild. Beautiful. 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. proteoides Taliensia Extremely slow-growing and dwarf evergreen shrubs. Like a tiny version of R. roxieanum with a thick woolly, reddish brown indumentum on the underside of the leaves. The attractive new growth is heavily indumented on both surfaces. The white to cream flushed rose and spotted flowers typically take years to appear. Forms a round dense mound when well grown and considered by many collectors to be the most choice (and difficult!) dwarf or alpine species. Requires a highly organic but extremely well-drained soil in a cool but bright position for successful cultivation. Native to steep slopes and cliffs from 12,000 to 15,000 ft. in China (SE Tibet, NW Yunnan & SW Sichuan). 74/118 ROBB:BRY ((10\R3\8 inches). This clone a Rock#. Grafts. 75/236 Greig:Berg (- 10\R3\8 inches). This clone a Rock# with longer and more narrow leaves. pruniflorum Glauca Small compact evergreen shrubs with smooth and peeling dark brown bark. The leaves are whitish on their lower sides with brown scales. The flowers (mid-spring) are dull crimson to plum-purple and shaped like little flattened bells. Good in partially shaded or even woodland conditions. A sweet little species rarely seen in cultivation, closely related to R. charitopes. Native to NE India (Arunachal Pradesh), Upper Burma and adjacent areas of SE Tibet where it occurs in forests and on rocky slopes from 8,000 to 13,000 ft. 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. 92/013 KW#7038:Leonardslee (+5\R1\3). I have not recorded the flowering data on this clone but I believe this has flowers more in the plum-purple range. Our first offering of this clone. 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 Mounding or upright evergreen shrubs with attractive rigid foliage. The newly emerged leaves are covered with a thin gray indumentum which sometimes persists on the upper surface and edges. The flowers (mid- spring) are white, white flushed pink, or pink, often with deeper colored lines on the outside and crimson flecks. A superb and easily grown garden plant which can be quite dwarf and slow-growing depending upon the clone. Relatively cold and heat tolerant. A common species from 6,000 to 13,000 ft. on the island of Taiwan where it is found in woodlands and on gravelly slopes, often above timberline. 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 'Exbury Form' Smith ('10'\R1\3). White flushed rose flowers with magenta flecks on this vigorous 1956 Award of Merit form. 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. 00/114 'Fine Bristles' KW#3953:WIND ((5). Flowers white flushed rose in this 1955 AM form.
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