Polygonum pennsylvanicum subsp. oneillii (Brenckle) Hultén

Polygonum pennsylvanicum subsp. oneillii (Brenckle) Hultén is a synonym sensu FNA Ed. Comm., 2005 of:

Persicaria lapathifolia (Linnaeus) Delarbre, an accepted species name sensu FNA Ed. Comm., 2005.