| Name | Juncus effusus subsp. solutus (Fernald & Wiegand) Hämet-Ahti |
| Authorship | (Fernald & Wiegand) Hämet-Ahti |
| Rank | Subspecies |
| Placed in | Juncus effusus Linnaeus |
| Holdings | 197 Specimens held in the Harvard University Herbaria identified as Juncus effusus subsp. solutus (Fernald & Wiegand) Hämet-Ahti |
| Identification made in | [no date] (193), 2002 (4) |