| Name | Schoenoplectiella purshiana var. williamsii (Fernald) Hayasaka |
| Authorship | (Fernald) Hayasaka |
| Rank | Variety |
| Placed in | Schoenoplectiella purshiana (Fernald) Lye |
| Citation | 2012 J. Jap. Bot. 87(3): 183 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Schoenoplectiella purshiana var. williamsii (Fernald) Hayasaka |
| Identification made in | [no date] (1) |
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