Polygonum amphibium var. natans Michaux nom. illeg.

Polygonum amphibium var. natans Michaux nom. illeg. is a synonym sensu FNA Ed. Comm., 2005 of:

Persicaria amphibia var. stipulacea (N. Coleman) H. Hara, an accepted variety name sensu Ballestas et al., 2024.