| Name | Juncus phaeocephalus var. gracilis Engelmann |
| Authorship | Engelmann |
| Rank | Variety |
| Placed in | Juncus phaeocephalus Engelmann |
| Citation | 1868 Trans. Acad. Sci. St. Louis 2: 484-485 |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Juncus phaeocephalus var. gracilis Engelmann |
| Identification made in | [no date] (3), 2022 (3) |
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