| Name | Carex williamsii Britton |
| Authorship | Britton |
| Rank | Species |
| Placed in | Carex Linnaeus |
| Citation | 1901 Bull. New York Bot. Gard. 2:159 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Carex williamsii Britton |
| Identification made in | [no date] (1) |
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