| Name | Juncus effusus var. gracilis Hooker |
| Authorship | Hooker |
| Rank | Variety |
| Placed in | Juncus effusus Linnaeus |
| Citation | 1838 Fl. Bor.-Amer. [Hooker] 2(10): 190 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Juncus effusus var. gracilis Hooker |
| Identification made in | [no date] (2) |
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