| Name | Juncus macer var. williamsii Fernald |
| Authorship | Fernald |
| Rank | Variety |
| Placed in | Juncus macer Gray |
| Citation | 1930 J. Bot. 68: 367 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Juncus macer var. williamsii Fernald |
| Identification made in | [no date] (1) |
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