| | 1. Ovary and fruit ± densely tomentose; perianth parts (at least inner) irregularly and shallowly fringed |
| V. insolitum |
| | 1' Ovary and fruit glabrous or with only a few straight hairs; perianth parts entire to deeply fringed |
| |
| | 2. Perianth deeply fringed |
| V. fimbriatum |
| | 2' Perianth entire or finely dentate |
| |
| | 3. Inflorescence dense, branches crowded, spreading or ascending |
| V. californicum var. californicum |
| | 3' Inflorescence loose, branches ± separated, lowest drooping |
| V. viride
|