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| 1 |
Herbs perennial; disc not well developed, annular. |
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(2) |
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Shrubs; disc well developed, 1/3 to wholly enveloping carpels. |
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(8) |
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| 2 (1) |
Leaflets and segments up to 9, entire; carpels glabrous |
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9 P. obovata |
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Leaflets and segments (of proximal leaves) more than 9, at least some of them segmented; carpels hairy or glabrous. |
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(3) |
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| 3 (2) |
Leaflets and segments of proximal leaves up to 20, some of them entire, mostly more than 2 cm wide. |
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(4) |
| + |
Leaflets and segments of proximal leaves more than 20, all or nearly all of them segmented, mostly less than 2 cm wide. |
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(6) |
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| 4 (3) |
Carpel 1(or 2) |
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12 P. emodi |
| + |
Carpels 2--5. |
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(5) |
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| 5 (4) |
Flowers usually several per shoot, both terminal and axillary; leaflets and segments with bristles along veins adaxially |
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11 P. lactiflora |
| + |
Flowers usually solitary, terminal; leaflets and segments glabrous |
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10 P. mairei |
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| 6 (3) |
Plants glabrous throughout |
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13 P. sterniana |
| + |
Leaflets and segments usually with bristles along veins adaxially; carpels usually brown-yellow hirsute. |
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(7) |
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| 7 (6) |
All or most sepals caudate at apex; roots cylindric, attenuate toward tip |
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14 P. anomala |
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Most sepals (at least 2) not caudate at apex; roots obviously tuberous |
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15 P. intermedia |
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| 8 (1) |
Flowers usually 2 or 3 per shoot, both terminal and axillary, ± pendent; disc fleshy, enveloping only base of carpels. |
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(9) |
| + |
Flower 1 per shoot, terminal, erect; disc leathery, 1/2 to wholly enveloping carpels. |
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(10) |
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| 9 (8) |
Carpels usually 2--5(--7); follicles to 4 × 1.5 cm; petals, filaments, and stigmas often not pure yellow; plants less than 2 m tall |
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7 P. delavayi |
| + |
Carpel nearly always 1; follicles 4.7--7 × 2--3.3 cm; petals, filaments, and stigmas always yellow; plants 1.5--3.5 m tall |
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8 P. ludlowii |
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| 10 (8) |
Disc ca. 1/2 enveloping carpels at anthesis; carpels 2--4(or 5), glabrous; leaflets (30--)35--65, all lobed |
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6 P. decomposita |
| + |
Disc wholly enveloping carpels at anthesis; carpels 5(--7), densely tomentose; leaflets usually less than 20 or, if more, at least some of them entire. |
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(11) |
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| 11 (10) |
Proximal leaves pinnate; leaflets more than 9. |
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(12) |
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Proximal leaves 2-ternate; leaflets usually ca. 9. |
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(13) |
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| 12 (11) |
Proximal leaves 2-pinnate; leaflets up to 15, ovate-lanceolate to ovate, mostly entire |
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4 P. ostii |
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Proximal leaves (2 or)3-pinnate; leaflets (17--)19--33, lanceolate or ovate-lanceolate and mostly entire, or ovate to ovate-orbicular and mostly lobed |
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5 P. rockii |
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| 13 (11) |
Leaflets adaxially often reddish, ovate or ovate-orbicular, mostly entire, abaxially densely tomentose at axils of major veins; petals often with a red spot at base |
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3 P. qiui |
| + |
Leaflets adaxially green, long ovate, ovate, or ovate-orbicular, mostly divided, abaxially glabrous, villous along veins, or villous throughout; petals unspotted at base. |
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(14) |
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| 14 (13) |
Leaflets long ovate or ovate, abaxially glabrous; terminal leaflets deeply 3-lobed, with an additional 1 to several lobes; lateral leaflets 2- or 3-lobed, sometimes entire; lobes acute at apex |
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1 P. suffruticosa |
| + |
Leaflets ovate-orbicular, abaxially villous along veins or throughout; all leaflets deeply 3-lobed; lobes again lobed, apex rounded to acute |
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2 P. jishanensis |
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