| Name | Carex virescens var. costata Dewey |
| Authorship | Dewey |
| Rank | Variety |
| Placed in | Carex virescens Muhlenberg ex Willdenow |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Carex virescens var. costata Dewey |
| Identification made in | [no date] (3) |
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