| 1 |
Calyx 8–12 mm; young shoots with persistent bud scales, densely rufous-tomentose and with dendroid
bristles. |
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264 Rhododendron longesquamatum |
| + |
Calyx 1–3 mm; young shoots without persistent bud scales, without dendroid bristles. |
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(2) |
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| 2 (1) |
Inflorescence rachis 4–5 cm; leaf blade 12–15(–20) × 4–5(–7) cm. |
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266 Rhododendron polytrichum |
| + |
Inflorescence rachis 0.5–2.5 cm; leaf blade 4–12(–16) × 1.2–4.2 cm. |
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(3) |
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| 3 (2) |
Inflorescence 3–5-flowered; rachis 5–6 mm. |
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(4) |
| + |
Inflorescence 5–20-flowered, if less than 7-flowered then rachis more than 10 mm. |
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(7) |
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| 4 (3) |
Style densely stipitate-glandular above, brown-lanate-tomentose below; corolla funnelform, ca. 4.2 cm. |
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275 Rhododendron pilostylum |
| + |
Style glabrous; corolla campanulate, 3–3.5 cm. |
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(5) |
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| 5 (4) |
Corolla purple to pink, with deep purple basal blotch, ca. 3.5 cm; leaf apex obtuse, apiculate. |
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271 Rhododendron oligocarpum |
| + |
Corolla pale pink to white or creamy white with purple flecks, ca. 3 cm; leaf apex acute or acuminate, apiculate. |
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(6) |
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| 6 (5) |
Petiole with verrucose spots; pedicel puberulent. |
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272 Rhododendron ziyuanense |
| + |
Petiole sparsely floccose; pedicel glabrous. |
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270 Rhododendron pachyphyllum |
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| 7 (3) |
Rachis ca. 6 mm; corolla crimson, without markings. |
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267 Rhododendron ochraceum |
| + |
Rachis 10–20 mm; corolla white to pink, sometimes deep red, mostly with dark basal blotches
and/or darker flecks. |
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(8) |
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| 8 (7) |
Corolla tubular-campanulate, often deep red, less often red or white; abaxial leaf surface setose,
setae glandular or branched at the tip, and persistent, especially near the base, sometimes
restricted to midrib. |
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265 Rhododendron strigillosum |
| + |
Corolla funnelform to campanulate or broadly campanulate, white to pink; abaxial leaf surface tomentose or floccose at least along midrib. |
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(9) |
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| 9 (8) |
Corolla funnelform, lobes ca. 2 × 2.3 cm; stamens 10–14, 3.7–4.8 cm. |
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276 Rhododendron morii |
| + |
Corolla campanulate or broadly campanulate, lobes 1–1.5 × 1.2–2 cm. |
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(10) |
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| 10 (9) |
Ovary pale brown or rufous tomentose or glabrous. |
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(11) |
| + |
Ovary glandular. |
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(12) |
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| 11 (10) |
Corolla campanulate; young shoots densely floccose-tomentose or setose. |
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268 Rhododendron pachytrichum |
| + |
Corolla broadly campanulate; young shoots tomentose. |
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274 Rhododendron maculiferum |
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| 12 (10) |
Adaxial leaf surface grayish floccose and glandular-hairy, glabrescent; inflorescence 5–10-flowered. |
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269 Rhododendron pseudochrysanthum |
| + |
Adaxial leaf surface glabrous; inflorescence 10–20-flowered. |
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273 Rhododendron pachysanthum |
