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 Image: Basionym: Genus Basionym: Notes:

1. Arabis suksdorfii Howell Arabis suksdorfii Howell

2. Arabis secunda Howell Arabis secunda Howell

3. Castilleja levisecta Greenm. Castilleja levisecta Greenm.

4. Peucedanum gormanii Howell Peucedanum gormanii Howell

5. Elymus howellii Scribn. & Merr. Elymus howellii Scribn. & Merr.

6. Polygonum polymorphum Ledeb. var. foliosum R. Keller Polygonum polymorphum Ledeb. var. foliosum R. Keller

7. Montia rubra Howell Montia rubra Howell

8. Ribes howellii Greene Ribes howellii Greene

9. Ribes howellii Greene Ribes howellii Greene

10. Pedicularis howellii A. Gray Pedicularis howellii A. Gray

11. Sanguisorba menziesii Rydb. Sanguisorba menziesii Rydb.

12. Saxifraga ferruginea Graham var. diffusa B.L. Johnson Saxifraga ferruginea Graham var. diffusa B.L. Johnson one specimen image; one type description (pdf).

13. Machaeranthera attenuata Howell Machaeranthera attenuata Howell

14. Mertensia nutans Howell Mertensia nutans Howell

15. Draba howellii S. Watson Draba howellii S. Watson

16. Penstemon adamsianus Howell Penstemon adamsianus Howell

17. Penstemon adamsianus Howell Penstemon adamsianus Howell

18. Ranunculus triternatus A. Gray Ranunculus triternatus A. Gray

19. Arctostaphylos intricata Howell Arctostaphylos intricata Howell

20. Arctostaphylos hispidula Howell Arctostaphylos hispidula Howell
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