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3. Rhododendron subsect. Grandia (Tagg) Sleumer, Bot. Jahrb. Syst. 74: 549. 1949.

大叶杜鹃亚组 da ye du juan ya zu

Hu Linzhen (胡琳贞 Hu Ling-cheng); David F. Chamberlain

Rhododendron ser. Grandia Tagg in J. B. Stevenson, Sp. Rhodod. 305. 1930 ["Grande"]; Waldemaria Klotzsch.

Trees or small trees, rarely large shrubs; young shoots stout, mostly ± tomentose. Leaf blade large, up to 70 cm, leathery or thickly leathery, oblong-elliptic to oblanceolate or obovate; abaxial surface with a 1- or 2-layered indumentum; adaxial surface glabrous when mature, usually plastered, compacted and agglutinated, rarely loose and felted indumentum. Inflorescence terminal, broad and large, 12–30-flowered; rachis stout, 10–60 mm. Calyx minute, 5–8-lobed; corolla broadly campanulate or ventricose-campanulate, rarely funnelform, (5–)6–8-lobed, fleshy, creamy-white, rose or deep purple-red, often with crimson basal blotch, with or without nectar pouches; stamens 10–20; ovary 6–20-locular, tomentose, glandular or glabrous. Capsule large, woody.

Twelve species: Asia; ten species (five endemic) in China.


1 Petiole flattened and winged, 0.5–2.5 cm.   (2)
+ Petiole ± cylindric, 1.5–5 cm.   (3)
       
2 (1) Petiole 1.5–2.5 cm; corolla obliquely campanulate, pale yellow to pink; ovary hairy.   244 Rhododendron praestans
+ Petiole 0.5–1 cm; corolla broadly campanulate, white to pink; ovary glabrous.   245 Rhododendron watsonii
       
3 (1) Abaxial leaf surface with loose, not agglutinated, indumentum.   (4)
+ Abaxial leaf surface with thin agglutinated indumentum.   242 Rhododendron protistum
       
4 (3) Indumentum pale brown, tomentose, sometimes forming a marginal band.    
+ Indumentum gray-white, 2-layered; upper layer arachnoid-tomentose, with a tendency to disappear.   243 Rhododendron magnificum
       
5 Vegetative bud scales persistent; flowers pink.   240 Rhododendron pudorosum
+ Vegetative bud scales deciduous; flowers crimson, pink, white, cream or yellow.   (6)
       
6 (5) Corolla 5-lobed, crimson; stamens 10; leaf blade 12–17 cm.   241 Rhododendron oreogenum
+ Corolla 6- or 8-lobed, pink or cream to yellow; stamens 14–20.   (7)
       
7 (6) Corolla pink; filaments glabrous.   239 Rhododendron montroseanum
+ Corolla cream to yellow; filaments hairy.   (8)
       
8 (7) Pedicel and ovary tomentose and glandular; leaf blade 14–30 cm.   236 Rhododendron grande
+ Pedicel and ovary tomentose but not glandular; leaf blade 9–70 cm.   (9)
       
9 (8) Leaf blade 20–70 cm; petiole 3–5 cm.   237 Rhododendron sinogrande
+ Leaf blade 9–21 cm; petiole 1.5–2.5 cm.   238 Rhododendron sidereum

Lower Taxa


 

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