| 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) |