| 1. Ovary 1-chambered; placentas parietal |
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| 2. Anthers ± 90° to filaments |
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| 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 |
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| 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 |
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| 5. Anthers ± 90° to filaments |
| D. insignis |
| 5' Anthers < 45° to filaments |
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| 6. 2 larger bristles at tips of 2 smaller anthers 0.62.7 mm, generally tightly twisted together |
| D. bicornuta |
| 7. 2 larger bristles at tips of 2 smaller anthers 0.61.5 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 1.62.7 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 |
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| 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 |
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| 10. Corolla 2.57 mm, lobes narrowly triangular; flower not inverting, upper corolla lip 3-lobed |
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| 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 |
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| 12. Anthers 2.53.5 mm, exserted from corolla tube |
| D. pulchella |
| 12' Anthers < 2.5 mm, included in corolla tube |
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| 13. Seeds spirally striate, appearing twisted; corolla without purple spots at throat |
| D. cuspidata |
| 13' Seeds longitudinally striate, not appearing twisted; corolla with 13 purple spots at throat |
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| 14. Upper corolla lobes glabrous |
| D. bella |
| 14' Upper corolla lobes ciliate-scabrous |
| D. concolor |
| 15. Fruit generally 1225 mm |
| var. brevior |
| var. concolor
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