| | 1. Perianth bristle barbs reflexed |
| |
| | 2. Flower bracts tawny to whitish; perianth bristles 10–12 |
| R. alba |
| | 2' Flower bracts ± dark brown; perianth bristles 5–7 |
| R. capitellata |
| | 1' Perianth bristle barbs ascending |
| |
| | 3. Perianth bristles = or > fruit; fruit body obovoid, tubercle chalky-white |
| R. californica |
| | 3' Perianth bristles < 1/2 fruit; fruit body ovoid to ± spheric, tubercle not chalky-white |
| R. globularis var. globularis
|