| Name | Carex aenea f. extrapolata Butters & Abbe |
| Authorship | Butters & Abbe |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Carex aenea Fernald |
| GUID | urn:lsid:ipni.org:names:45680-2 |
| Citation | 1953 Rhodora 55: 130 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Carex aenea f. extrapolata Butters & Abbe |
| Identification made in | [no date] (1) |