| 1 |
Leaves ternately divided. |
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(2) |
| + |
Leaves pinnate or digitately 5-foliolate. |
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(6) |
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| 2 (1) |
Leaflets sparsely to densely tomentose on the undersides. |
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(3) |
| + |
Leaflets pilose on the undersides. |
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(4) |
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| 3 (2) |
Styles short (up to 1.4 mm), epicalyx segments narrowly linear to lanceolate. |
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4 Potentilla Subgenus Potentilla Section Niveae |
| + |
Styles long (2-2.5 mm), epicalyx segments broader, elliptic ovate. |
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4 Potentilla Subgenus Potentilla Section Haematochroae |
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| 4 (2) |
Terminal leaflet deeply trisect, divided up to the midrib, lateral leaflets bisect nearly to the midrib. |
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4 Potentilla Subgenus Potentilla Section Persicae |
| + |
Terminal and lateral leaflets not segmented. |
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(5) |
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| 5 (4) |
Styles cone-shaped. |
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4 Potentilla Subgenus Potentilla Section Rivales |
| + |
Styles club-shaped. |
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4 Potentilla Subgenus Potentilla Section Aureae |
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| 6 (1) |
Leaves pinnate. |
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(7) |
| + |
Leaves digitately 5-foliolate. |
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(9) |
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| 7 (6) |
Leaflets often pinnatisect, undersurface of leaflets (between the nerves) with dense or sparse floccose or crispate hairs or with curved or flexuous thin hairs. |
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4 Potentilla Subgenus Potentilla Section Pensylvanicae |
| + |
Leaflets dentate, undersurface of leaflets with thick, pilose straight hairs only. |
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(8) |
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| 8 (7) |
Annuals or short lived perennials. Leaflets irregularly dentate, petioles with short (c. 1 mm) eglandulose hairs, stigma dilated, style short (up to 0.8 mm). |
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4 Potentilla Subgenus Potentilla Section Rivales |
| + |
Perennials, leaflets regularly dentate, petioles with very long (c. 3-4 mm) glandulose hairs, stigma not dilated, style long (1.4-2 mm). |
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4 Potentilla Subgenus Potentilla Section Tanacetifoliae |
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| 9 (6) |
Stem prostrate, trailing, flowers solitary. |
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4 Potentilla Subgenus Potentilla Section Potentilla |
| + |
Stem erect or ascending, not trailing, flowers more than one. |
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(10) |
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| 10 (9) |
Undersides of leaflets pilose. |
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(11) |
| + |
Undersurface of leaflets densely floccose or argenteo-tomentose. |
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(13) |
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| 11 (10) |
Flowers crimson-red, stigma not dilated, styles 1.5-2 mm long. |
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4 Potentilla Subgenus Potentilla Section Haematochroae |
| + |
Flowers yellow, stigma dilated, styles shorter, less than 1.4 mm. |
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(12) |
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| 12 (11) |
Stem often branching above the middle, stem leaves very poorly developed leaflets segments ± acute, style 1.1-1.4 mm long. |
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4 Potentilla Subgenus Potentilla Section Chrysanthae |
| + |
Stem often branching from the base, stem leaves well developed, leaflet segments blunt, style short (0.8-0.9 mm). |
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4 Potentilla Subgenus Potentilla Section Rivales |
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| 13 (10) |
Flowers stem usually terminal, tomentose, stem leaves well developed, petioles tomentose or with additional villose hairs. |
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4 Potentilla Subgenus Potentilla Section Terminales |
| + |
Flowering stem usually lateral, floccose, stem leaves poorly developed, petioles floccose. |
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4 Potentilla Subgenus Potentilla Section Niveae |
