| 1. Corolla appendages 00.1 mm |
| C. californica |
| 2. Ovary and fruit conic, top acute |
| var. apiculata |
| 2' Ovary and fruit obovoid, top depressed |
| |
| var. papillosa |
| 3' Perianth not papillate |
| |
| 4. Corolla bulged out between stamens |
| var. breviflora |
| 4' Corolla not bulged out between stamens |
| var. californica |
| 1' Corolla appendages 0.72.5 mm |
| |
| C. approximata |
| |
| 6. Corolla shallowly bell- to urn-shaped, tube ± shorter than wide |
| |
| 7. Corolla appendage divisions generally 0few, knob-like |
| C. denticulata |
| 7' Corolla appendage divisions fewmany, finger-like |
| |
| 8. Ovary and fruit top unthickened |
| C. pentagona |
| 8' Ovary and fruit top thickened |
| C. indecora |
| 9. Pedicel and calyx not papillate |
| var. indecora |
| 9' Pedicel and calyx ± papillate |
| var. neuropetala |
| 6. Corolla funnel- or bell-shaped, tube longer than wide |
| |
| 10. Anthers sessile; corolla lobes < tube |
| C. subinclusa |
| 10' Anthers on filaments; corolla lobes < to > tube |
| |
| 11. Perianth parts obtuse, gland-dotted, not papillate; corolla appendage divisions few, scattered, finger-like; near streams, rivers, lakes |
| C. cephalanthi |
| 11' Perianth parts acute, sometimes papillate and gland-dotted; corolla appendage divisions many, finger- or knob-like; salty marshes, flats, or ponds, vernal pools |
| |
| 12. Corolla appendages 0.71.2 mm, divisions finger-like; vernal pools |
| C. howelliana |
| 12' Corolla appendages 1.21.5 mm, divisions knob-like; salty marshes, flats, ponds |
| C. salina |
| 13. Perianth papillate; flower ± 3 mm |
| var. papillata |
| 13' Perianth not papillate; flower 24.5 mm |
| |
| 14. Flower 34.5 mm; coastal salt marshes |
| var. major |
| 14' Flower 23 mm; inland salt flats |
| var. salina
|