| Name | Polygonum natans f. hartwightii (A. Gray) Stanford |
| Authorship | (A. Gray) Stanford |
| Rank | Forma |
| NomenclaturalStatus | Unknown |
| Placed in | Polygonum natans (Michaux) Eaton |
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Polygonum natans f. hartwightii (A. Gray) Stanford |
| Identification made in | [no date] (3), 1924 (4) |
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