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... more about "Polygonum douglasii"
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Greene +
Douglas’s knotweed +  and renouée de Douglas +
Alta. +, B.C. +, Man. +, Ont. +, Que. +, Sask. +, Yukon +, Ariz. +, Calif. +, Colo. +, Idaho +, Iowa +, Mich. +, Minn. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.Mex. +, N.Y. +, Oreg. +, S.Dak. +, Utah +, Vt. +, Va. +, Wash. +  and Wyo. +
300-3000 m +
Dry, often disturbed places, rock outcrops, sandy ground +
Flowering Jun–Oct. +
Bull. Calif. Acad. Sci. +
Polygonum douglasii var. latifolium +, Polygonum emaciatum +, Polygonum montanum +, Polygonum tenue var. commune +  and Polygonum tenue var. latifolium +
Polygonum douglasii +
Polygonum sect. Duravia +
species +