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6. Rhododendron subsect. Heliolepida (Hutchinson) Sleumer, Bot. Jahrb. Syst. 74: 536. 1949.

亮鳞杜鹃亚组 liang lin du juan ya zu

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

Rhododendron ser. Heliolepida Hutchinson in J. B. Stevenson, Sp. Rhodod. 320. 1930 ["Heliolepis"].

Shrubs or small trees, 0.9–5(–10) m tall; young shoots scaly, otherwise glabrous or pubescent. Leaves fragrant when crushed; leaf blade leathery; abaxial surface scales dense, yellow to brown, large or small, unequal or all similar; adaxial surface usually scaly, otherwise glabrous or pubescent along midrib. Inflorescence terminal, umbellate, 2–7(to many)-flowered. Calyx undeveloped, 1–2 mm, 5-lobed or undulate; corolla broadly funnelform-campanulate or campanulate, often lobed to the middle, pale red or deep purplish red, less often white, often with darker spots, outer surface scaly, otherwise glabrous or sometimes pubescent; stamens 10, unequal; ovary 5(or 6)-locular; style erect, not scaly, glabrous or pubescent at base. Capsule cylindric, 7–18 mm; seed wingless or with finlike structures.

Five species: China, Myanmar; five species (three endemic) in China.

1 Axillary bud bracts persistent; leaf blade 1.3–5 cm; corolla 1.3–2.5 cm.   68 Rhododendron bracteatum
+ Axillary bud bracts soon deciduous; leaf blade 3.5–12.5 cm; corolla 2.2–3.5 cm.   (2)
2 (1) Young shoots, petiole and midrib pubescent, or petioles hispid.   (3)
+ Young shoots, petiole and leaf blade glabrous.   (4)
3 (2) Young shoots pubescent; corolla puberulous outside along dorsal suture; leaf abaxial surface with scales ca. 1.5 × their own diameter apart.   69 Rhododendron invictum
+ Young shoots glabrous; corolla outside without hairs; leaf abaxial surface with scales less than their own diameter apart or contiguous.   70 Rhododendron hirsutipetiolatum
4 (2) Leaf blade 5–12.5 cm, abaxial surface with scales uniformly large, pale yellowish or grayish white, 0.5–2 × their own diameter apart.   71 Rhododendron heliolepis
+ Leaf blade 3.5–8 cm, abaxial surface with scales dimorphic, rust-red; small scales overlapping or half their own diameter apart, large scales along central veins.   72 Rhododendron rubiginosum

Lower Taxa


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