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Asteraceae (89)
Erigeron (12)
Senecio (7)
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 Image: Basionym: Genus Basionym: Notes:

1. Arnica cernua Howell Arnica cernua Howell Arnica

2. Cirsium howellii Petrak Cirsium howellii Petrak

3. Microseris oligantha Greene Microseris oligantha Greene

4. Antennaria howellii Greene Antennaria howellii Greene

5. Senecio hesperius Greene Senecio hesperius Greene

6. Aster militaris Greene Aster militaris Greene

7. Microseris oligantha Greene Microseris oligantha Greene

8. Arnica spathulata Greene Arnica spathulata Greene

9. Erigeron cervinus Greene Erigeron cervinus Greene

10. Erigeron amplifolius Howell Erigeron amplifolius Howell Erigeron

11. Senecio subvestitus Howell Senecio subvestitus Howell

12. Erigeron confinis Howell Erigeron confinis Howell

13. Senecio oreganus Howell Senecio oreganus Howell

14. Pyrrocoma congesta Greene Pyrrocoma congesta Greene

15. Erigeron confinis Howell Erigeron confinis Howell

16. Erigeron confinis Howell Erigeron confinis Howell

17. Senecio hesperius Greene Senecio hesperius Greene Senecio

18. Hieracium longiberbe Howell Hieracium longiberbe Howell Hieracium

19. Senecio oreganus Howell Senecio oreganus Howell

20. Wyethia lanceolata Howell Wyethia lanceolata Howell
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