| Name | Clematis williamsii A. Gray |
| Authorship | A. Gray |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Clematis Linnaeus |
| GUID | urn:lsid:ipni.org:names:710204-1 |
| Citation | 1857 Narr. Exped. China Japan [Perry] 2: 306 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Clematis williamsii A. Gray |
| Identification made in | [no date] (1), 2004 (1), 2015 (1) |