Polygonum heterophyllum subsp. boreale (Lange) Á. Löve & D. Löve

Polygonum heterophyllum subsp. boreale (Lange) Á. Löve & D. Löve is a synonym sensu FNA Ed. Comm., 2005 of:

Polygonum aviculare subsp. boreale (Lange) Karlsson, an accepted subspecies name sensu FNA Ed. Comm., 2005.