| Name | Hydrophyllum occidentale (S. Watson) A. Gray |
| Authorship | (S. Watson) A. Gray |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Hydrophyllum |
| Contains | Hydrophyllum occidentale var. fremontii A. Gray Hydrophyllum occidentale var. watsonii A. Gray |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Hydrophyllum occidentale (S. Watson) A. Gray |
| Identification made in | [no date] (5) |