| Name | Scirpus atrovirens f. sychnocephalus (Cowles) S. F. Blake |
| Authorship | (Cowles) S. F. Blake |
| Rank | Forma |
| Placed in | Scirpus atrovirens Muhlenberg |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Scirpus atrovirens f. sychnocephalus (Cowles) S. F. Blake |
| Identification made in | [no date] (1) |
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