| Name | Juncus trifidus subsp. carolinianus Hämet-Ahti |
| Authorship | Hämet-Ahti |
| Rank | Subspecies |
| Placed in | Juncus trifidus Linnaeus |
| Citation | 1980 Veröff. Geobot. Inst. ETH Stiftung Rübel Zürich 69(2): 7 |
| Holdings | 9 Specimens held in the Harvard University Herbaria identified as Juncus trifidus subsp. carolinianus Hämet-Ahti |
| Identification made in | [no date] (9) |
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