Narrow-leaf Knotweed (Polygonum rurivagum Jord. ex Boreau)

Also classified as Polygonum aviculare var. rurivagum (Jord. ex Boreau) Nyman, Polygonum aviculare subsp. rurivagum (Jord. ex Boreau) Berher.

BONAP considers this a subspecies of prostrate knotweed (Polygonum aviculare) but we separate them per POWO's treatment.