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3. Rhododendron subg. Pseudorhodorastrum Sleumer, Bot. Jahrb. Syst. 74: 529. 1949.

糙叶杜鹃亚属 cao ye du juan ya shu

Fang Ruizheng (方瑞征 Fang Rhui-cheng); David F. Chamberlain

Small shrubs, evergreen, (0.1–)0.2–2.5(–3.5) m tall; new foliage shoots arising from uppermost (subterminal) buds, and from leaf axils; young shoots scaly, sometimes also pilose or strigose. Leaf blade with abaxial surface scaly and often also hairy. Inflorescences axillary, usually subterminal just below the terminal vegetative buds, umbellate, usually subtended by persistent bud scales, 1–5-flowered. Calyx usually small, to well-developed, shallowly cup-shaped to 5-lobed; corolla broadly funnelform to tubular, 5-lobed, often to below middle, 0.8–2.7 cm, pale red, white or purplish red, outside glabrous or glandular-scaly or base sometimes pubescent, rarely scaly; stamens 8–10; filaments usually partly pubescent, often with glabrous base; ovary 5-locular, scaly, often also hairy; style slender, erect. Capsule usually cylindric, 5–14 mm, scaly, sometimes pubescent. Seed wingless.

Ten species: Bhutan, China, Sikkim; ten species (nine endemic) in China.

Rhododendron subg. Pseudorhodorastrum was not recognized by Cullen (Notes Roy. Bot. Gard. Edinburgh 39: 1–207. 1980) and is probably not confirmed by DNA sequencing.

1 Adaxial leaf surface pilose or strigose; abaxial surface rarely glabrous; stamens 8–10.   1 Rhododendron sect. Trachyrhodion
+ Adaxial leaf surface with no hairs, abaxial surface white; stamens 10.   (2)
2 (1) Inflorescences axillary, 1- or 2-flowered, flowering shoot racemelike; outer surface of corolla densely shortly pilose; seeds with appendages at both ends.   2 Rhododendron sect. Rhabdorhodion
+ Inflorescences subterminal, 2–5-flowered, usually clustered; outer surface of corolla without hairs; seeds lacking appendages.   3 Rhododendron sect. Rhodobotrys

Lower Taxa


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