Polygonum caurianum subsp. hudsonianum S.J. Wolf & McNeill

Polygonum caurianum subsp. hudsonianum S.J. Wolf & McNeill is a synonym sensu FNA Ed. Comm., 2005 of:

Polygonum fowleri subsp. hudsonianum (S.J. Wolf & McNeill) Costea & Tardif, an accepted subspecies name sensu FNA Ed. Comm., 2005.