| Name | Polygonum hydropiperoides var. psilostachyum H. St. John |
| Authorship | H. St. John |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Polygonum hydropiperoides Michaux |
| GUID | urn:lsid:ipni.org:names:206245-2 |
| Citation | 1921 Proc. Boston Soc. Nat. Hist. 36(1): 71 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Polygonum hydropiperoides var. psilostachyum H. St. John |
| Identification made in | [no date] (3), 2019 (1) |
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