Polygonum fowleri, called (in English) Fowler's knotweed or Hudsonian knotweed or (in French) Renouée de Fowler or Renouée de la baie d'Hudson, is a plant species native to the seashores of the northern part of North America. It has been reported from every Canadian province and territory except Alberta and Saskatchewan, as well as from Maine, Alaska, Washington, Oregon, California, and St. Pierre & Miquelon. It is usually found in gravelly locations along the seacoast. Subspecies Two subspecies are recognized, treated by some botanists as distinct species: