| 1. Perianth evenly purple or blue (except midveins generally darker) |
| |
| 2. Perianth tube rounded at base; ovary stalk < ovary |
| T. grandiflora var. howellii |
| 2' Perianth tube tapered at base; ovary stalk > ovary |
| |
| 3. Stamens attached to perianth tube at 1 level; perianth throat translucent, shiny |
| T. bridgesii |
| 3' Stamens attached to perianth tube at 2 levels; throat generally not translucent and shiny |
| |
| 4. Perianth 1419 mm; filaments ± linear c Klamath Ranges |
| T. crocea var. modesta |
| 4' Perianth generally 2045 mm; filaments sometimes wider at base |
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| 5. Anthers ± 1.5 mm; filaments wider at base; s Channel Islands |
| T. clementina |
| 5' Anthers 25 mm; filaments linear; widespread |
| T. laxa |
| 1' Perianth white (sometimes flushed purple) to golden-yellow |
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| 6. Perianth white, sometimes flushed purple |
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| 7. Pedicel > 2 × perianth; ovary yellow or green |
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| 8. Ovary green; perianth lobes reflexed |
| T. ixioides subsp. cookii |
| 8' Ovary bright yellow; perianth lobes ascending |
| T. peduncularis |
| 7' Pedicel < 2 × perianth; ovary green |
| |
| 9. Filaments wider at base; anthers yellow |
| T. hyacinthina |
| 9' Filaments linear; anthers lilac |
| T. lilacina |
| 6' Perianth straw-colored to bright golden-yellow |
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| 10. Stamens attached to perianth tube at 2 levels |
| T. crocea var. crocea |
| 10' Stamens attached to perianth tube at 1 level |
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| 11. Forked appendages outside of anthers 0 |
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| 12. Filaments of 2 lengths |
| T. lugens |
| T. montana |
| 11' Forked appendages present outside of anthers |
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| 13. Appendages blunt, short; perianth tube generally = lobes |
| T. dudleyi |
| 13' Appendages pointed, conspicuous; perianth tube << lobes |
| T. ixioides |
| 14. Perianth tube 710 mm; perianth often golden-yellow; c&s Central Western California |
| subsp. ixioides |
| 14' Perianth tube 37 mm; perianth generally straw-colored to pale yellow; Klamath Ranges, Sierra Nevada |
| |
| 15. Anthers generally blue (cream); filament appendages straight or curved in |
| subsp. anilina |
| 15' Anthers cream or yellow (blue); filament appendages generally curved out |
| subsp. scabra
|