| Name | Delphinium occidentale subsp. quercicola Ewan |
| Authorship | Ewan |
| Rank | Subspecies |
| Placed in | Delphinium occidentale (S. Watson) S. Watson ex Coulter |
| Citation | 1945 Univ. Colorado Stud., Ser. D, Phys. Sci. 2(2): 139 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Delphinium occidentale subsp. quercicola Ewan |
| Identification made in | 1943 (1) |
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