| Name | Hypericum williamsii N. Robson |
| Authorship | N. Robson |
| Rank | Species |
| Placed in | Hypericum Linnaeus |
| Citation | 1977 J. Jap. Bot. 52(9): 279 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Hypericum williamsii N. Robson |
| Identification made in | [no date] (1), 2023 (1) |
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