| Name | Clarkia williamsonii (Durand & Hilgard) F. H. Lewis & M. E. Lewis |
| Authorship | (Durand & Hilgard) F. H. Lewis & Marg. E. Lewis |
| Rank | Species |
| Placed in | Clarkia Pursh |
| Citation | 1953 Madroño 12(2): 34 |
| Holdings | 41 Specimens held in the Harvard University Herbaria identified as Clarkia williamsonii (Durand & Hilgard) F. H. Lewis & M. E. Lewis |
| Identification made in | [no date] (11), 1951 (30) |
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