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| 1 |
Terminal inflorescences large broad cymose panicles with numerous flowers. |
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(2) |
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Terminal inflorescences subracemes with few flowers or flowers several in clusters or solitary. |
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(4) |
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| 2 (1) |
Leaves glabrous abaxially, ovate-lanceolate or elliptic-lanceolate, not divided; flowers with petals. |
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185 R. wuzhianus |
| + |
Leaves tomentose or pubescent abaxially, narrowly ovate or suborbicular; flowers with or without petals. |
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(3) |
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| 3 (2) |
Leaves narrowly ovate, abaxially tomentose, margin undivided or slightly undulate; flowers usually apetalous. |
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183 R. jinfoshanensis |
| + |
Leaves suborbicular, abaxially pubescent, margin 3–5-lobed, lobes triangular; flowers with petals. |
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184 R. lobatus |
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| 4 (1) |
Leaves abaxially tomentose. |
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(5) |
| + |
Leaves abaxially pubescent or subglabrous. |
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(7) |
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| 5 (4) |
Leaves 3–5-lobed, suborbicular or broadly ovate, deciduously tomentose, but hairs persistent abaxially in age; stipules broader, 1–1.5 cm, palmately parted. |
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188 R. tsangiorum |
| + |
Leaves undivided or lobed, abaxially persistent tomentose; stipules narrowly ovate to ovate- lanceolate, 1.5–2 cm, margin pinnately laciniate lobed. |
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(6) |
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| 6 (5) |
Leaves ovate to oblong, bristly on both surfaces, not divided or somewhat undulate, coarsely sharply serrate; stipules tomentose, villous; flowers 2–3 cm in diam. |
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186 R. tricolor |
| + |
Leaves suborbicular to ovate, bristly only abaxially, margin 3–5-lobed, sharply serrulate; stipules tomentose; flowers 1–2 cm in diam. |
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187 R. multisetosus |
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| 7 (4) |
Flowers solitary or in clusters of 2–4, terminal or axillary; leaves broadly ovate, undivided, rarely lobed;outer sepals usually not lobed. |
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(8) |
| + |
Flowers 4–12 in terminal subracemes or several in clusters; leaves suborbicular or broadly narrowly ovate, lobed; outer sepals usually divided. |
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(9) |
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| 8 (7) |
Plants with stalked glands; leaves acute to acuminate apically, both surfaces glabrous or nearly so; pedicel 2–4 cm; sepals triangular-lanceolate, 0.8–1.4 cm. |
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192 R. ourosepalus |
| + |
Plants without stalked glands; leaves obtuse, rarely acute apically, both surfaces sparsely villous; pedicel 5–10 mm; sepals broadly ovate, 7–8 mm. |
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193 R. polyodontus |
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| 9 (7) |
Leaves broadly narrowly ovate, terminal lobe several × as long as lateral lobes, apically shortly acuminate, rarely acute, lateral lobes obtuse; flowers 1–1.5 cm in diam.; stipules deeply laciniate; sepals narrowly lanceolate; outer sepals 2- or 3-laciniate. |
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191 R. amphidasys |
| + |
Leaves orbicular or suborbicular, terminal lobe slightly longer than or as long as lateral lobes, acute, obtuse, or rounded; flowers 1.5–2(–2.5) cm in diam.; stipules palmately parted to middle or nearly to base; sepals narrowly ovate, narrowly ovate-lanceolate, or broadly ovate-lanceolate to oblong-ovate; outer sepals leaflike, laciniate, pinnately divided, or dissected apically. |
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(10) |
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| 10 (9) |
Leaves 3–5-lobed, terminal lobe acute apically, lateral lobes obtuse, rarely acute, margin coarsely serrate; stipules palmately parted nearly to base; sepals narrowly ovate or narrowly ovate-lanceolate; outer sepals leaflike, laciniate or pinnately divided. |
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189 R. treutleri |
| + |
Leaves 5(–7)-lobed, lobes obtuse to rounded apically, margin sharply serrate; stipules palmatiparted to middle or 1/3 length; sepals broadly ovate-lanceolate to oblong-ovate; outer sepals dissected apically. |
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190 R. fanjingshanensis |
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