| Name | Polygonum dumetorum f. cristatum (Engelmann & A. Gray) B. L. Robinson |
| Authorship | (Engelmann & A. Gray) B. L. Robinson |
| Rank | Forma |
| Placed in | Polygonum dumetorum Linnaeus |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Polygonum dumetorum f. cristatum (Engelmann & A. Gray) B. L. Robinson |
| Identification made in | [no date] (1) |
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