| Name | Rhamnus californica subsp. occidentalis (Howell ex Greene) C. B. Wolf |
| Authorship | (Howell ex Greene) C. B. Wolf |
| Rank | Subspecies |
| Placed in | Rhamnus californica Eschscholtz |
| Holdings | 13 Specimens held in the Harvard University Herbaria identified as Rhamnus californica subsp. occidentalis (Howell ex Greene) C. B. Wolf |
| Identification made in | [no date] (11), 1935 (1), 1941 (1) |
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