Polygonum hydropiperoides var. opelousanum (Riddell ex Small) W. Stone

Polygonum hydropiperoides var. opelousanum (Riddell ex Small) W. Stone is a synonym sensu FNA Ed. Comm., 2005 of:

Persicaria hydropiperoides (Michaux) Small, an accepted species name sensu FNA Ed. Comm., 2005.