| 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) |
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|
| 2 (1) |
Leaves 2.5–3 × 1.5–2 cm, elliptic; petiole 5–7 mm; inflorescence 2–3-flowered. |
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281 Rhododendron martinianum |
| + |
Leaves 4–8 × 2.5–4 cm; petiole 10–20 mm; inflorescence 3–7-flowered. |
|
(3) |
| |
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| 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 |
| |
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|
|
| 4 (1) |
Young shoots, petioles, and pedicels with shortly stipitate or sessile glands, rarely glabrous. |
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(5) |
| + |
Young shoots, petioles, and pedicels glandular-setose. |
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(6) |
| |
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|
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| 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 |
| |
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| 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) |
| |
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|
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| 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. |
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278 Rhododendron dasycladoides |
| |
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| 8 (6) |
Leaf blade base cordate, abaxial indumentum olivaceous or brownish; corolla yellow or white, with red spots. |
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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 |
