| 1. Calyx lobes 24; corolla tube 20-veined near base; nutlet surface smooth, cobblestone-like, or round-tubercled |
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| 2. Stem (except inflorescence) generally ± glabrous, glaucous, ± pink below; leaf glaucous; nutlet surface smooth, with a longitudinal groove, scar not obvious |
| A. vernicosa |
| 3. Corolla 1218 mm, 814 mm wide at top, orange; generally heterostylous; nutlet groove forked at base |
| var. furcata |
| 3' Corolla 812 mm, 28 mm wide at top, yellow; not heterostylous; nutlet groove unforked |
| var. vernicosa |
| 2' Stem hairy, not glaucous, green; leaf not glaucous; nutlet surface smooth, cobblestone-like, or round-tubercled, ungrooved, with lateral scar |
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| 4. Corolla 1422 mm, 1016 mm wide at top; heterostylous |
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| 5. Nutlet surface cobblestone-like; corolla yellow-orange; South Coast Ranges, Western Transverse Ranges |
| A. douglasiana |
| 5' Nutlet surface smooth; corolla red-orange; west-central Great Central Valley |
| A. grandiflora |
| 4' Corolla 816 mm, 210 mm wide at top; not heterostylous |
| A. tessellata |
| 6. Corolla 1216 mm, 610 mm wide at top; anthers not appressed to, often below stigma |
| var. gloriosa |
| 6' Corolla 812 mm, 26 mm wide at top; anthers appressed to stigma |
| var. tessellata |
| 1' Calyx lobes 5; corolla tube 10-veined near base; nutlet surface generally sharp-tubercled, often ridged |
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| 7. Nutlet 12 mm; leaf margin finely toothed; coastal or on inland dunes |
| A. spectabilis |
| 8. Stem erect; all calyx lobes free; nutlet 11.5 mm; heterostylous |
| var. microcarpa |
| 8' Stem generally decumbent; 23 calyx lobes ± half fused; nutlet 1.52 mm; heterostylous or not |
| var. spectabilis |
| 7' Nutlet 24 mm; leaf margin generally entire; inland, including dunes |
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| 9. Corolla bilateral, tube bent, limb with 2 red-orange marks; heterostylous or anthers in upper, lower groups |
| A. lunaris |
| 9' Corolla radial, tube straight, limb with 0 or 5 red-orange marks; not heterostylous |
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| 10. Corolla ± closed by hairy bulges at top of tube; stamens, style included in tube |
| A. lycopsoides |
| 10' Corolla open; stamens, style exserted from tube, included in throat |
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| 11. Corolla 1020 mm, 814 mm wide at top; anthers not appressed to, generally below stigma |
| A. eastwoodiae |
| 11' Corolla 411 mm, 210 mm wide at top; anthers generally appressed to stigma |
| A. menziesii |
| 12. Corolla 711 mm, 410 mm wide at top, ± orange |
| var. intermedia |
| 12' Corolla 47 mm, 23 mm wide at top, pale yellow |
| var. menziesii
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