| Name | Polygonum sawatchense Small |
| Authorship | Small |
| Rank | Species |
| Placed in | Polygonum Linnaeus |
| Contains | Polygonum sawatchense subsp. oblivium Costea & Tardif |
| Citation | 1893 Bull. Torrey Bot. Club 20: 213 |
| Holdings | 37 Specimens held in the Harvard University Herbaria identified as Polygonum sawatchense Small |
| Identification made in | [no date] (25), 2003 (12) |