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FOC | Family List | FOC Vol. 14 | Ericaceae

12. Rhododendron subsect. Tephropepla Sleumer, Bot. Jahrb. Syst. 74: 532. 1949.

灰背杜鹃亚组 hui bei du juan ya zu

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

Small to moderately sized shrubs, 0.3–3(–5) m tall sometimes epiphytic; young shoots scaly, sometimes puberulous. Leaf blade leathery, mostly relatively narrow; abaxial surface often pale glaucous green, papillose, scales usually deeply sunk in pits, sometimes of 2 forms, golden, brown or dark brown to black; adaxial surface usually scaly, occasionally glabrous or puberulous. Inflorescence usually terminal, rarely axillary, umbellate or racemose-umbellate, (1–)3–9-flowered. Pedicels scaly; calyx large, (2–)3–8 mm, deeply 5-lobed, scaly, margin sometimes ciliate; corolla tubular-campanulate to funnel-campanulate, pink, white, or yellow; outer surface usually scaly, sometimes glabrous; stamens 10, declinate; ovary 5-locular; style straight, glabrous or scaly at base. Capsule cylindric, 5–10 mm, scaly. Seeds wingless, obscurely finned.

Six species: China, India, Myanmar; six species (four endemic) in China.

1 Scales on abaxial leaf surface very distant, usually 2–4 × their own diameter apart; inflorescence racemose; calyx lobes oblong to lanceolate.   (2)
+ Scales on abaxial leaf surface contiguous or up to their own diameter apart; inflorescence umbellate or racemose-umbellate; calyx lobes usually rounded.   (4)
2 (1) Corolla purplish, 2.5–2.8 cm.   133 Rhododendron tsinlingense
+ Corolla white to pink, 1.3–2.5 mm.   (3)
3 (2) Leaf blade 5–13 cm, with conspicuous acuminate drip tip; corolla ca. 2.5 cm, white; calyx ca. 8 mm.   131 Rhododendron hanceanum
+ Leaf blade 1.6–6 cm, acute, without a conspicuous drip tip; corolla 1.3–2 cm, white to pink; calyx 2–3.5 mm.   132 Rhododendron longistylum
4 (1) Corolla pink to deep purplish rose, outside often not scaly; calyx 5–8 mm, lobes spreading.   130 Rhododendron tephropeplum
+ Corolla cream to yellow, outside often scaly; calyx 3–5 mm, lobes erect or reflexed.   (5)
5 (4) Stem and branches with rough bark; calyx lobes erect; scales on abaxial leaf surface not contiguous or overlapping.   128 Rhododendron xanthostephanum
+ Stem and branches with smooth bark; calyx lobes reflexed; scales on abaxial leaf surface contiguous or overlapping.   129 Rhododendron auritum

Lower Taxa


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