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8. Rhododendron subsect. Selensia (Tagg) Sleumer, Bot. Jahrb. Syst. 74: 547. 1949.

漏斗杜鹃亚组 lou dou du juan ya zu

Fang Mingyuan (方明渊); David F. Chamberlain

Rhododendron subser. Selensia Tagg in J. B. Stevenson, Sp. Rhodod. 710. 1930 ["Selense"].

Shrubs or small trees; young shoots glandular-hairy. Leaf blade thinly leathery or leathery, rarely papery, elliptic or long-obovate; abaxial surface glabrous or with thin indumentum. Inflorescence (1–)2–11-flowered, rachis short, less than 5 mm. Calyx small, 1–5(–10) mm, lobes unequal; corolla funnelform, base narrow, 5-lobed, white to rose-pink, often with dark spots; stamens 10; ovary glandular or setose; style smooth (glandular to apex in R. ×erythrocalyx). Capsule slender, curved.

About nine species: China, Myanmar; nine species (seven endemic) in China.

1 Leaf blade obovate or elliptic, apex rounded, abaxial surface glabrous; ovary glandular.   (2)
+ Leaf blade narrowly elliptic, apex acute, abaxial surface hairy at least on midrib.   (4)
2 (1) Leaves 2.5–3 × 1.5–2 cm, elliptic; petiole 5–7 mm; inflorescence 2–3-flowered.   281 Rhododendron martinianum
+ Leaves 4–8 × 2.5–4 cm; petiole 10–20 mm; inflorescence 3–7-flowered.   (3)
3 (2) Calyx 2–3 mm; corolla 2.5–3.5 cm, pinkish to rose; style glabrous; leaf blade base rounded.   280 Rhododendron selense
+ Calyx 4–7 mm; corolla 3.5–4 cm, milky-white to yellowish; style base glandular; leaf blade base ± cordate.   285 Rhododendron x erythrocalyx
4 (1) Young shoots, petioles, and pedicels with shortly stipitate or sessile glands, rarely glabrous.   (5)
+ Young shoots, petioles, and pedicels glandular-setose.   (6)
5 (4) Leaf blade leathery; calyx 3–7(–10) mm; ovary densely glandular.   282 Rhododendron esetulosum
+ Leaf blade thinly leathery; calyx 2–3 mm; ovary glandular and hairy.   277 Rhododendron calvescens
6 (4) Leaf blade abaxially shortly setose at least on base of midrib; calyx lobes elliptic, obovate-elliptic or ovate, apex rounded.   (7)
+ Leaf blade abaxially with downy indumentum; calyx lobes lanceolate or ovate to oblong, apex acute.   (8)
7 (6) Leaf blade 4–5.5 cm wide; young shoots and petioles with glandular setae 3–7 mm.   283 Rhododendron hirtipes
+ Leaf blade 2–3.5 cm wide; young shoots and petioles with glandular setae less than 2 mm.   278 Rhododendron dasycladoides
8 (6) Leaf blade base cordate, abaxial indumentum olivaceous or brownish; corolla yellow or white, with red spots.   279 Rhododendron bainbridgeanum
+ Leaf blade base cuneate or rounded, abaxial indumentum yellowish brown or brownish; corolla white to pinkish, with deep red lines.   284 Rhododendron setiferum

Lower Taxa


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