| Name | Juncus effusus subsp. pacificus (Fernald & Wiegand) Piper & Beattie |
| Authorship | (Fernald & Wiegand) Piper & Beattie |
| Rank | Subspecies |
| Placed in | Juncus effusus Linnaeus |
| Holdings | 20 Specimens held in the Harvard University Herbaria identified as Juncus effusus subsp. pacificus (Fernald & Wiegand) Piper & Beattie |
| Identification made in | [no date] (19), 2007 (1) |
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