| B. orcuttii |
| |
| | 2. Perianth lobes widely spreading |
| |
| | 3. Staminodes = perianth lobe width; serpentine, North Coast Ranges |
| 2 B. stellaris |
| | 3' Staminodes < perianth lobe width; if on serpentine not in North Coast Ranges |
| |
| | 4. Perianth tube not narrowed above ovary |
| |
| | 5. Staminodes strongly inrolled |
| B. insignis |
| | 5' Staminodes not inrolled |
| |
| | 6. Staminodes tapered, reflexed against perianth |
| B. filifolia |
| | 6' Staminodes abruptly pointed, erect |
| B. kinkiensis |
| | 4' Perianth tube narrowed above ovary |
| |
| | 7. Anthers obcordate, axis tissue on outside with obvious enlarged cells |
| 2 B. pallida |
| | 7' Anthers linear, axis tissue without enlarged cells on outside |
| |
| | 8. Inflorescence 2–10 cm; inner perianth lobes 5–7 mm wide |
| B. minor |
| | 8' Inflorescence 10–25 cm; inner perianth lobes 4–5 mm wide |
| B. purdyi |
| | 2' Perianth lobes ascending |
| |
| | 9. Perianth tube narrowed above ovary or staminodes = perianth width |
| |
| | 10. Perianth tube narrowed above ovary; staminodes narrowed at tip, 2-lobed |
| 2 B. pallida |
| | 10' Perianth tube not narrowed above ovary; staminodes wide throughout, unlobed |
| 2 B. stellaris |
| | 9' Perianth tube not narrowed above ovary; staminodes narrower than perianth |
| |
| | 11. Staminodes narrowly linear, wavy |
| |
| | 12. Filaments with 2 thread-like appendages; perianth lobes generally < 2 × tube |
| B. appendiculata |
| | 12' Filaments appendages generally 0; perianth lobes > 2 × tube |
| B. californica |
| | 13. Perianth lobes 6–10 mm wide; ovary 7–11 mm |
| var. californica |
| | 13' Perianth lobes 4–7 mm wide; ovary 5–7 mm |
| var. leptandra |
| | 11' Staminodes wider at base, not wavy |
| |
| | 14. Staminodes standing away from stamens; perianth tube funnel-shaped |
| B. elegans |
| | 15. Staminodes flat, straight; Northwestern California, Sierra Nevada |
| subsp. elegans |
| | 15' Staminodes inrolled, tips reflexed; nw Klamath Ranges? |
| subsp. hooveri |
| | 14' Staminodes leaning in toward stamens; perianth tube bell-shaped |
| |
| | 16. Flower 24–38 mm; staminodes strongly inrolled |
| B. coronaria |
| | 17. Perianth blue-purple; widespread |
| subsp. coronaria |
| | 17' Perianth rose-purple; Inner North Coast Ranges |
| subsp. rosea |
| | 16' Flower 14–24 mm; staminodes little inrolled |
| |
| | 18. Anther axis tissue entire; ovary purple |
| B. jolonensis |
| | 18' Anther axis tissue dentate; ovary green |
| B. terrestris |
| | 19. Inflorescence 2–20 cm; flowers 26–33 mm |
| subsp. kernensis |
| | 19' Inflorescence 0.5–7 cm; flowers 16–25 mm |
| subsp. terrestris
|