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20. Rhododendron subsect. Barbata (Tagg) Sleumer, Bot. Jahrb. Syst. 74: 544. 1949.

硬刺杜鹃亚组 ying ci du juan ya zu

Fang Mingyuan (方明渊); David F. Chamberlain

Rhododendron subser. Barbata Tagg in J. B. Stevenson, Sp. Rhodod. 126. 1930 ["Barbatum"].

Shrubs or small trees; bark smooth, peeling; young shoots usually stoutly setose, or glandular-hairy (setae sometimes absent in R. barbatum). Leaf blade elliptic, oblong to broadly obovate, glabrous or with abaxial surface coarsely setose to glandular-hairy at maturity, sometimes with thin continuous or discontinuous layer of dendroid hairs. Inflorescence dense, 10–20-flowered; rachis 5–7(–10)mm. Calyx small to large, usually colored, to 15 mm, lobes rounded; corolla tubular-campanulate, 5-lobed, fleshy, deep red to rarely rose, with nectar pouches at base; stamens (8–)10; filaments glabrous; ovary glabrous to densely glandular-hairy, with or without brown branched hairs, and glands; style glabrous.

Five species: Bhutan, China, India, Nepal, Myanmar, Sikkim; four species (one endemic) in China.

1 Leaf blade abaxially glabrous except for midrib which is setose near base; pedicel glabrous.   413 Rhododendron barbatum
+ Leaf blade abaxially glandular-hairy or ± tomentose; pedicel glandular-hairy.   (2)
2 (1) Pedicel sparsely glandular; leaf blade broadly ovate or subobovate, abaxial surface sparsely glandular- hairy.   414 Rhododendron exasperatum
+ Pedicel densely long glandular-hairy or glandular-setose; leaf blade elliptic to oblong-lanceolate or obovate, abaxial surface ± tomentose.   (3)
3 (2) Leaf blade elliptic to oblong-lanceolate, 10.5–12.3 × 3.3–4 cm; style ca. 1.6 cm.   415 Rhododendron argipeplum
+ Leaf blade broadly elliptic or oblong-elliptic to obovate, 8–10.5(–16.5) × (3–)3.7–4.5(–9) cm; style ca. 2.1 cm.   416 Rhododendron erosum

Lower Taxa


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