| Name | Juncus tenuis var. congestus Engelmann |
| Authorship | Engelmann |
| Rank | Variety |
| Placed in | Juncus tenuis Willdenow |
| GUID | urn:lsid:ipni.org:names:132325-2 |
| Citation | 1866 Trans. Acad. Sci. St. Louis 2: 450 |
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Juncus tenuis var. congestus Engelmann |
| Identification made in | [no date] (6), 1866 (1) |
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