Polygonum heterophyllum var. angustissimum (Meisner) Lindman

Polygonum heterophyllum var. angustissimum (Meisner) Lindman is a synonym sensu FNA Ed. Comm., 2005 of:

Polygonum aviculare subsp. rurivagum (Jordan ex Boreau) Berher, an accepted subspecies name sensu FNA Ed. Comm., 2005.