| Name | Carex ×aestivaliformis Mackenzie |
| Authorship | Mackenzie |
| Rank | Species |
| Placed in | Carex Linnaeus |
| Citation | 1910 Bull. Torrey Bot. Club 37: 238 |
| Holdings | 11 Specimens held in the Harvard University Herbaria identified as Carex ×aestivaliformis Mackenzie |
| Identification made in | [no date] (5), 1996 (1), 2005 (4), 2012 (1) |
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