| | 1. Ovary 1-chambered; placentas parietal |
| |
| | 2. Anthers ± 90° to filaments |
| |
| | 3. Lower corolla lobes obtuse, abruptly toothed, blue with 2 oblong, orange-yellow spots in central white field |
| D. bacigalupii |
| | 3' Lower corolla lobes acute, blue with a central white field |
| D. elegans |
| | 2' Anthers < 45° to filaments |
| |
| | 4. Larger 3 anthers hairy at tips; calyx lobes unequal |
| D. montana |
| | 4' Larger 3 anthers glabrous at tips; calyx lobes subequal |
| D. yina |
| | 1' Ovary 2-chambered; placentas axile |
| |
| | 5. Anthers ± 90° to filaments |
| D. insignis |
| | 5' Anthers < 45° to filaments |
| |
| | 6. 2 larger bristles at tips of 2 smaller anthers 0.6–2.7 mm, generally tightly twisted together |
| D. bicornuta |
| | 7. 2 larger bristles at tips of 2 smaller anthers 0.6–1.5 mm, < anthers; corolla tube dark blue-purple on upper side, without prominent veins |
| var. bicornuta |
| | 7' 2 larger bristles at tips of 2 smaller anthers 1.6–2.7 mm, generally > anthers; corolla tube light blue or pale yellow on upper side, prominently net-veined |
| var. picta |
| | 6' 2 larger bristles at tips of 2 smaller anthers < 0.5 mm, not twisted |
| |
| | 8. Sinus between 2 upper corolla lobes with a backward-projecting, short horn |
| D. ornatissima |
| | 9. Upper corolla lobes generally abundantly hairy within near tips |
| var. eximia |
| | 9' Upper corolla lobes glabrous or sparsely hairy within |
| var. ornatissima |
| | 8' Sinus between 2 upper corolla lobes plane, without a horn |
| |
| | 10. Corolla 2.5–7 mm, lobes narrowly triangular; flower not inverting, upper corolla lip 3-lobed |
| |
| | 11. Seed longitudinally striate, not appearing twisted; Modoc Plateau |
| D. laeta |
| | 11' Seed spirally striate, appearing twisted; Inner North Coast Ranges, Great Central Valley |
| D. pusilla |
| | 10' Corolla > 7 mm, upper lobes narrowly triangular or elliptic, lower obovate; flower inverting, upper corolla lip 2-lobed |
| |
| | 12. Anthers 2.5–3.5 mm, exserted from corolla tube |
| D. pulchella |
| | 12' Anthers < 2.5 mm, included in corolla tube |
| |
| | 13. Seeds spirally striate, appearing twisted; corolla without purple spots at throat |
| D. cuspidata |
| | 13' Seeds longitudinally striate, not appearing twisted; corolla with 1–3 purple spots at throat |
| |
| | 14. Upper corolla lobes glabrous |
| D. bella |
| | 14' Upper corolla lobes ciliate-scabrous |
| D. concolor |
| | 15. Fruit generally 12–25 mm |
| var. brevior |
| var. concolor
|