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| 1 |
Inflorescence sparsely flowered; petals 1-5 and obsolescent, or absent. |
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(2) |
| + |
Inflorescence densely flowered; petals 5, not obsolescent. |
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(3) |
| |
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| 2 (1) |
Sepals 5, subleathery, glandular hairy abaxially; petals 2-5 and obsolescent, or absent |
|
6 A. macrocarpa |
| + |
Sepals 4 or 5, submembranous, glabrous abaxially; petals absent, sometimes 1(-5) and obsolescent |
|
7 A. rivularis |
| |
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|
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| 3 (1) |
Sepals glabrous at margin; petals spatulate to oblanceolate. |
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(4) |
| + |
Sepals glandular ciliate at margin; petals linear or linear-oblanceolate. |
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(5) |
| |
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|
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| 4 (3) |
Plants 32-150 cm tall; sepal margin entire, apex obtuse; petals usually oblanceolate, 1-veined, obtuse or retuse at apex |
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4 A. longicarpa |
| + |
Plants 15-30 cm tall; sepal margin sparsely dentate distally, apex truncate or rounded; petals usually spatulate, 4-6-veined, acute at apex |
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5 A. macroflora |
| |
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|
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| 5 (3) |
Sepals glandular hairy abaxially |
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3 A. rubra |
| + |
Sepals glabrous abaxially. |
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(6) |
| |
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|
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| 6 (5) |
Panicle scarcely 12 cm in width, branches densely brown long crisped hairy; leaflets usually acute to shortly acuminate at apex |
|
1 A. chinensis |
| + |
Panicle to 17 cm in width, branches glandular pilose; leaflets usually shortly acuminate to acuminate at apex |
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2 A. grandis |
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