| Name | Cymopterus williamsii R. L. Hartman & Constance |
| Authorship | R. L. Hartman & Constance |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Cymopterus |
| GUID | urn:lsid:ipni.org:names:905920-1 |
| Citation | 1985 Brittonia 37: 91 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Cymopterus williamsii R. L. Hartman & Constance |
| Identification made in | [no date] (2), 1979 (1) |