| 1. Perennial; receptacle rim 0.55 mm; cotyledons generally 2-lobed |
| 2 E. californica |
| 1' Annual; receptacle rim generally 00.3 mm; cotyledons generally entire |
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| 2. Receptacle rim 0.55 mm; cotyledons sometimes 2-lobed |
| 2 E. californica |
| 2' Receptacle rim 00.3 mm; cotyledons entire |
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| 3. Leaves generally basal; leaf segments acute; petals yellow; flower bud glabrous |
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| 4. Flower bud generally nodding; seed minutely pitted; petals (10)1225 mm; Desert |
| E. glyptosperma |
| 4' Flower bud erect; seed with prominent discontinuous ridges; petals 712 mm; Sierra Nevada Foothills, Great Central Valley |
| E. lobbii |
| 3' Leaves basal and cauline; leaf segments acute or obtuse; petals yellow or orange; flower bud glabrous or hairy |
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| 5. Flower bud generally hairy, nodding; petiole generally hairy |
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| 6. Petals yellow, bases sometimes orange-spotted, 1015(20) mm; receptacle < 1.5 mm wide |
| E. hypecoides |
| 6' Petals orange or deep yellow throughout, 1540 mm; receptacle > 1.5 mm wide |
| E. lemmonii subsp. lemmonii |
| 5' Flower bud glabrous, nodding or erect; petiole generally glabrous |
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| 7. Flower bud generally nodding; East of Sierra Nevada, Desert |
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| 8. Leaf segments widened to tip, generally obtuse, < 2 mm; leaves grayish or bluish green; petals 326 mm; seeds generally oblong to elliptic |
| E. minutiflora |
| 8' Leaf segments not widened to tip, acute, > 1.5 mm; leaves bright green or yellow-green; petals 830 mm; seeds generally round |
| E. parishii |
| 7' Flower bud generally erect; not Desert |
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| 9. Receptacle obconic, < 2.5 mm wide |
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| 10. Flower bud long-pointed generally > 1/4 bud; plant appearing compact from short lower leaf segments; mainland |
| E. caespitosa |
| 10' Flower bud blunt or short-pointed < 1/4 bud; plant appearing open from ± long lower leaf segments; Channel Islands |
| E. ramosa |
| 9' Receptacle barrel-shaped, > 2 mm wide |
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| 11. Petals 2040 mm, orange or deep yellow; sw Tehachapi Mountain Area, n Western Transverse Ranges |
| E. lemmonii subsp. kernensis |
| 11' Petals 315 mm, yellow; Inner North Coast Ranges, San Francisco Bay Area, Inner South Coast Ranges, eastern Outer South Coast Ranges |
| E. rhombipetala
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