| Name | Carex umbellata var. tonsa Fernald |
| Authorship | Fernald |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Carex umbellata Schkuhr ex Willdenow |
| GUID | urn:lsid:ipni.org:names:47334-2 |
| Citation | 1902 Proc. Amer. Acad. Arts 37: 507 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Carex umbellata var. tonsa Fernald |
| Identification made in | [no date] (5) |
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