| 1 |
Ultimate segments of basal and lower leaves linear or linear-lanceolate. |
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(2) |
| + |
Ultimate segments of basal and lower leaves ovate or ovate-lanceolate. |
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(5) |
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| 2 (1) |
Ultimate leaf segments 2–5 mm wide; petals apex long-linear. |
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(3) |
| + |
Ultimate leaf segments 1–2.5 mm wide; petals apex acute or obtuse-acute. |
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(4) |
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| 3 (2) |
Rays (5–)8–13, (1.5–)3–5.5 cm; calyx teeth conspicuous, ovate-triangular. |
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1 Acronema schneideri |
| + |
Rays 3–7, 0.3–3.5 cm; calyx teeth obsolete. |
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2 Acronema graminifolium |
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| 4 (2) |
Root conic; leaf blade 2–5-pinnate. |
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3 Acronema chienii |
| + |
Root tuberous, ovoid-globose; leaf blade 2–3-pinnate. |
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4 Acronema yadongense |
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| 5 (1) |
Bracteoles 1–4. |
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(6) |
| + |
Bracteoles absent. |
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(7) |
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| 6 (5) |
Rays 1–2 cm; petals apex linear. |
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5 Acronema tenerum |
| + |
Rays less than 1 cm; petals apex short-acute, not linear. |
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6 Acronema minus |
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| 7 (5) |
Calyx teeth developed. |
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(8) |
| + |
Calyx teeth obsolete. |
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(10) |
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| 8 (7) |
Basal leaf blade ternate, dark purple abaxially; upper leaves heteromorphic. |
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7 Acronema astrantiifolium |
| + |
Basal leaf blade 2–3-ternate-pinnate, not purplish abaxially; upper leaves homomorphic. |
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(9) |
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| 9 (8) |
Leaf blade 2-ternate; petals white or pink; calyx teeth ca. 0.2 mm. |
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8 Acronema sichuanense |
| + |
Leaf blade 2–3-ternate-pinnate; petals purple-red; calyx teeth ca. 3 mm. |
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9 Acronema forrestii |
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| 10 (7) |
Petals apex acute; fruit oblong, apex slightly separated. |
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10 Acronema chinense |
| + |
Petals apex linear or caudate-acute; fruit ovoid to broad-ovoid, apex not separated. |
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(11) |
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| 11 (10) |
Plants 4–25 cm (A. nervosum may be taller); basal and cauline leaves homogeneous; lateral umbels 1–2. |
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(12) |
| + |
Plants 25–80 cm; basal and cauline leaves heteromorphic; lateral umbels often numerous. |
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(15) |
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| 12 (11) |
Leaves 1–2-ternate. |
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(13) |
| + |
Leaves 1–2-ternate-pinnate. |
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(14) |
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| 13 (12) |
Leaves ternate, leaflets crenulate. |
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11 Acronema muscicola |
| + |
Leaves 2-ternate, leaflets 3-toothed. |
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12 Acronema alpinum |
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| 14 (12) |
Leaflets 2–3 mm wide, entire or 3-toothed. |
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13 Acronema nervosum |
| + |
Leaflets ca. 7 mm wide, irregularly pinnatifid or 3-lobed. |
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14 Acronema handelii |
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| 15 (11) |
Rays ca. 1 cm; pedicels 1–2 mm; petals white. |
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15 Acronema brevipedicellatum |
| + |
Rays 1.5–6 cm; pedicels 3–15 mm; petals purple, pink or white. |
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(16) |
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| 16 (15) |
Leaflets of basal leaves entire or apex 2-toothed; rays subequal. |
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16 Acronema xizangense |
| + |
Leaflets of basal leaves apex 3-lobed, irregularly coarse-toothed or serrate; rays unequal. |
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(17) |
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| 17 (16) |
Basal leaves 1–2-ternate-pinnate; rays very unequal. |
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17 Acronema gracile |
| + |
Basal leaves 2–3-pinnate; rays unequal or slightly unequal. |
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(18) |
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| 18 (17) |
Petals white (sometimes purple), apex densely papillate. |
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18 Acronema hookeri |
| + |
Petals purple or white with purplish-red margin, apex glabrous or papillate. |
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(19) |
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| 19 (18) |
Leaves 2-pinnate, lower pinnae short-petiolulate, leaflets ca. 6 mm wide. |
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19 Acronema commutatum |
| + |
Leaves 2–3-pinnate, primary and secondary pinnae all long-petiolulate, leaflets 7–15 mm wide. |
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20 Acronema paniculatum |
