"*Polygonum douglasii subsp. spergulariiforme (Meisn. ex Small) J.C. Hickman)" . . "Polygonum spergulariiforme is a North American species of flowering plants in the buckwheat family known by the common name Spurry knotweed or fall knotweed . It grows in western Canada (British Columbia and Saskatchewan) and the western United States (primarily Washington, Oregon, and northern and central California but with a few isolated populations in Idaho, Wyoming and Montana).Polygonum spergulariiforme is a green, branching herb up to 50 cm (20 in) tall."@en . . . "*Polygonum coarctatum Dougl. ex Meisn. 1856 not Meisn. 1826" . . "*Polygonum sperguliaeforme (Meisn. ex Small)" . . . . .