| Name | Polygonum sawatchense subsp. oblivium Costea & Tardif |
| Authorship | Costea & Tardif |
| Rank | Subspecies |
| Placed in | Polygonum sawatchense Small |
| Citation | 2003 Sida 20: 1637 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Polygonum sawatchense subsp. oblivium Costea & Tardif |
| Identification made in | [no date] (4), 2003 (1) |
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