| Name | Juncus effusus var. costulatus Fernald |
| Authorship | Fernald |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Juncus effusus Linnaeus |
| GUID | urn:lsid:ipni.org:names:132118-2 |
| Citation | 1921 Rhodora 23: 239 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Juncus effusus var. costulatus Fernald |
| Identification made in | [no date] (2) |
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