| 1. Sepals 1830 mm; styles in fruit 2030(35) mm, plumose |
| A. occidentalis |
| 1' Sepals 525 mm; styles in fruit < 5 mm, glabrous to puberulent |
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| 2. Basal leaf generally 1; cauline leaves simple or 1-ternate, blade or leaflet crenate to lobed; plant from rhizome; fruit glabrous to puberulent |
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| 3. Cauline leaves simple, ± sessile; sepals 1525 mm |
| A. deltoidea |
| 3' Cauline leaves generally 1-ternate, petioles 840 mm; sepals 520 mm |
| A. oregana |
| 2' Basal leaves fewmany; cauline leaves dissected; plant from tuber atop slender caudex or from branched caudex; fruit densely woolly or silky |
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| 4. Plant from tuber atop slender caudex; fruit cluster oblong to elliptic, (15)2030 mm; eastern Desert Mountains |
| A. tuberosa |
| 4' Plant from branched caudex; fruit cluster generally ovoid to spheric, 1020 mm; Klamath Ranges, Cascade Range, Sierra Nevada |
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| 5. Segments of basal leaves linear, generally < 1.5 mm wide; cauline petioles generally short; sepals white to bluish |
| A. drummondii |
| 5' Segments of basal leaves oblong to lanceolate, generally 24 mm wide; cauline petioles generally ± 0; sepals yellowish to purplish |
| A. multifida
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