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13. Rhododendron subsect. Arborea (Tagg) Sleumer, Bot. Jahrb. Syst. 74: 545. 1949.

树形杜鹃亚组 shu xing du juan ya zu

Fang Mingyuan (方明渊); David F. Chamberlain

Rhododendron subser. Arborea Tagg in J. B. Stevenson, Sp. Rhodod. 12. 1930 ["Arboreum"].

Trees; bark rough; young shoots tomentose or floccose, glabrescent. Leaf blade elliptic to oblanceolate; abaxial surface densely spongy to compacted, white to fawn, tomentose, hairs dendroid sometimes with a floccose rufous upper layer. Inflorescence dense, 10–30-flowered. Calyx minute, 1–2 mm; corolla campanulate or tubular-campanulate, 5-lobed, pink to deep crimson, magenta or lilac, very rarely white, with nectar pouches; stamens 10; ovary densely tomentose, rarely glandular; style glabrous.

About four species: Bhutan, China, India, Kashmir, Myanmar, Nepal, Sikkim, Sri Lanka, Thailand, Vietnam; four species in China.

This is a subsection of uncertain affinities, though probably allied to R. subsect. Argyrophylla and, in particular, to R. denudatum.

1 Pedicel with some glandular hairs in among indumentum; capsule ca. 3 cm.   336 Rhododendron arboreum
+ Pedicel without glandular hairs; capsule 1.5–2 cm.   (2)
2 (1) Calyx glabrous; inflorescence 20–30-flowered; abaxial leaf surface indumentum 2-layered with dense woolly upper layer.   339 Rhododendron lanigerum
+ Calyx hairy; inflorescence 10–20-flowered; abaxial leaf surface indumentum 1-layered, felted or spongy.   (3)
3 (2) Corolla tubular-campanulate; rachis ca. 2 cm.   337 Rhododendron niveum
+ Corolla campanulate; rachis ca. 1 cm.   338 Rhododendron delavayi

Lower Taxa


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