. . . . . "*Polygonum douglasii var. johnstonii (Munz)" . . "*Polygonum douglasii subsp. johnstonii (Munz) J.C.Hickman)" . "Polygonum sawatchense is a North American species of plants in the buckwheat family. It in the western United States and western Canada, from the Pacific Coast to the western Great Plains, so from British Columbia south to California and east as far as New Mexico, Colorado, Saskatchewan, and the Dakotas.Polygonum sawatchense is a branching, hairless herb up to 50 cm (20 in) tall. Leaves are narrow, up to 45 mm (1.8 in) long."@en . . .