| 1. Leaf 23-ternate-pinnately dissected, segments linear or linear-oblong, entire, 210 cm |
| A. lineariloba |
| 1' Leaf 13-pinnate or -ternate-pinnate, leaflets lanceolate to widely ovate, generally serrate or dentate, rarely entire, 315 cm |
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| 2. Bractlets conspicuous, 515 mm; rays, pedicels not webbed at base |
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| 3. 1° leaflets generally sharply reflexed; fruit very compressed, ovate to round, 34 mm, ribs on back much narrower than marginal, thin |
| A. genuflexa |
| 3' 1° leaflets not reflexed; fruit cylindric, ± oblong, 49 mm, ribs subequal, widely, thickly corky-winged |
| A. lucida |
| 2' Bractlets generally 0 or inconspicuous; rays, pedicels webbed at base |
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| 4. Basal leaves 1-ternate-pinnate |
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| 5. Rays subequal, spreading-ascending to reflexed |
| A. callii |
| 5' Rays unequal, ascending |
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| 6. Leaf oblong; leaflets entire to remotely serrate; rays 714; ovary minutely bristly; fruit oblong, 45 mm |
| A. kingii |
| 6' Leaf triangular-ovate; leaflets sharply serrate; rays 1550; ovary generally glabrous; fruit oblong to ovate, 67 mm |
| A. californica |
| 4' Basal leaves 23-ternate-pinnate |
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| A. tomentosa |
| 7' Plant bright green at least on leaf upper sides |
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| 8. Plant coastal; leaf thick, lower side often white-tomentose |
| A. hendersonii |
| 8' Plant not coastal; leaf thin, green, both sides generally glabrous |
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| 9. Petals, ovary glabrous |
| A. arguta |
| A. breweri
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