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16. Rhododendron subsect. Glauca (Hutchinson) Sleumer, Bot. Jahrb. Syst. 74: 530. 1949.

苍白杜鹃亚组 cang bai du juan ya zu

Yang Hanbi (杨汉碧 Yang Han-pi); David F. Chamberlain

Rhododendron ser. Glauca Hutchinson in J. B. Stevenson, Sp. Rhodod. 293. 1930 ["Glaucum"].

Shrubs, 0.25–2 m tall; bark often coppery, smooth and flaking; young shoots scaly. Leaves small; leaf blade leathery, aromatic, usually lanceolate to obovate; abaxial surface white or pale glaucous, scales sparse to almost contiguous, dimorphic, the smaller golden, more numerous than the dark brown larger; adaxial surface usually sparsely scaly. Inflorescence terminal, umbellate or racemose, 3–10-flowered; pedicels slender, scaly; calyx 3–10 mm, deeply 5-lobed, scaly, margin usually ciliate; corolla ± campanulate, lobes spreading, white, pink, purple, or yellow, sometimes spotted; stamens 10, nearly as long as corolla; filaments pubescent; ovary 5-locular, mostly densely scaly; style short, stout, usually sharply deflexed, sometimes scaly and/or puberulous at base. Capsule ovoid to cylindric-ovoid, 4–10 mm, scaly. Seeds wingless, with obscure appendages.

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

1 Corolla pale yellow or greenish yellow; scales on abaxial leaf surface 2–10 × their own diameter apart.   145 Rhododendron brachyanthum
+ Corolla white, pink, rose to purple; scales on abaxial leaf surface nearly contiguous to 2 × their own diameter apart.   (2)
2 (1) Corolla 1–1.3 cm; scales on abaxial leaf surface very close, nearly contiguous.   149 Rhododendron pruniflorum
+ Corolla 1.3–2.6(–3.8) cm; scales on abaxial leaf surface at least 1/2 their own diameter apart.   (3)
3 (2) Calyx lobes ovate-lanceolate to lanceolate, apex markedly acute; corolla tubular-campanulate.   146 Rhododendron tubiforme
+ Calyx lobes rounded, ovate to ovate-oblong, apex rounded or obtuse; corolla campanulate or broadly campanulate.   (4)
4 (3) Calyx lobes 4–7 mm; style usually puberulous over its whole length; capsule ca. 5 mm.   147 Rhododendron shweliense
+ Calyx lobes 6–10 mm; style glabrous; capsule 8–10 mm.   148 Rhododendron charitopes

Lower Taxa


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