| 1 |
Racemes basally leafless; sepals persistent in fruit. |
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(2) |
| + |
Racemes basally leafy (usually leafless in P. maackii and P. laxiflora); sepals soon caducous in fruit. |
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(4) |
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| 2 (1) |
Branchlets and abaxial surface of leaf blades glabrous; peduncle subglabrous to sparsely pubescent. |
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1 P. buergeriana |
| + |
Branchlets pubescent and leaf blades pubescent at least on veins; peduncle densely pubescent. |
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(3) |
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| 3 (2) |
Leaf blade margin acutely serrate; inflorescence base without squamose involucral bracts. |
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2 P. stellipila |
| + |
Leaf blade margin serrulate; inflorescence base with persistent squamose involucral bracts. |
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3 P. perulata |
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| 4 (1) |
Inflorescence base leafless or sometimes with 1 or 2 small bracts near base; leaves abaxially glandular. |
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(5) |
| + |
Inflorescences base leafy; leaf blade abaxially non-glandular. |
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(6) |
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| 5 (4) |
Leaf blade abaxially glandular, midvein pubescent. |
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4 P. maackii |
| + |
Leaf blade not glandular, midvein sericeous-villous. |
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5 P. laxiflora |
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| 6 (4) |
Peduncles and pedicels thickened, conspicuously lenticellate in fruit. |
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(7) |
| + |
Peduncles and pedicels not thickened and not lenticellate in fruit. |
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(8) |
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| 7 (6) |
Branchlets and abaxial surface of leaf blades glabrous or very rarely sparsely pubescent when young. |
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14 P. napaulensis |
| + |
Branchlets and abaxial surface of leaf blades pubescent. |
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15 P. wilsonii |
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| 8 (6) |
Style exserted. |
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6 P. grayana |
| + |
Style not exserted (not seen in P. brunnescens or P. integrifolia). |
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(9) |
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| 9 (8) |
Style 1/2 as long as stamens; pedicel 1–1.5(–2.4) cm. |
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7 P. avium |
| + |
Style nearly as long as stamens (not seen in P. brunnescens or P. integrifolia); pedicel shorter than 1 cm. |
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(10) |
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| 10 (9) |
Leaf blade margin serrulate. |
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13 P. cornuta |
| + |
Leaf blade margin entire, crenulate, or serrate. |
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(11) |
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| 11 (10) |
Leaf blade margin aristate serrate; inflorescences 16–30 cm. |
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(12) |
| + |
Leaf blade margin not aristate serrate; inflorescences 8–15 cm. |
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(13) |
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| 12 (11) |
Leaf blade elliptic to ovate-oblong, abaxially brown pubescent; peduncles and pedicels brown pubescent. |
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8 P. brunnescens |
| + |
Leaf blade oblong to rarely elliptic or lanceolate, glabrous; peduncles and pedicels not brown pubescent. |
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9 P. brachypoda |
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| 13 (11) |
Leaf blade margin entire or very rarely apically sparsely serrate. |
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12 P. integrifolia |
| + |
Leaf blade margin crenulate or appressed serrate. |
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(14) |
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| 14 (13) |
Leaf blade abaxially glabrous; branchlets glabrous or pubescent; peduncles and pedicels pubescent. |
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10 P. obtusata |
| + |
Leaf blade abaxially velutinous; branchlets velutinous; peduncles and pedicels velutinous. |
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11 P. velutina |
