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Limnanthaceae (28)
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 Image: Basionym: Genus Basionym: Notes:
1. Lepidium reticulatum Howell Lepidium reticulatum Howell
2. Potentilla ashlandica Greene Potentilla ashlandica Greene
3. Microseris oligantha Greene Microseris oligantha Greene
4. Ranunculus occidentalis Nutt. var. howellii Greene Ranunculus occidentalis Nutt. var. howellii Greene
5. Arabis howellii S. Watson Arabis howellii S. Watson
6. Microseris oligantha Greene Microseris oligantha Greene
7. Polygonum howellii Greene Polygonum howellii Greene
8. Saxifraga petiolata B.L. Johnson Saxifraga petiolata B.L. Johnson one specimen image; one type description (pdf).
9. Orthocarpus cuspidatus Greene ssp. cuspidatus Greene Orthocarpus cuspidatus Greene ssp. cuspidatus Greene
10. Senecio subvestitus Howell Senecio subvestitus Howell
11. Velaea howellii Coulter & Rose Velaea howellii Coulter & Rose
12. Lepidium oreganum Howell ex Greene Lepidium oreganum Howell ex Greene
13. Ranunculus occidentalis Nutt. var. howellii Greene Ranunculus occidentalis Nutt. var. howellii Greene
14. Alopecurus howellii Vasey Alopecurus howellii Vasey
15. Potentilla ciliata Howell Potentilla ciliata Howell
16. Androsace asprella Greene Androsace asprella Greene
17. Eriophyllum lanceolatum Howell Eriophyllum lanceolatum Howell
18. Limnanthes floccosa Howell Limnanthes floccosa Howell
19. Limnanthes pumila Howell Limnanthes pumila Howell
20. Limnanthes floccosa Howell Limnanthes floccosa Howell
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