Polygonum

Scientific Name Polygonum polygaloides Wallich ex Meisn. ssp. confertiflorum (Nutt. ex Piper) J.C. Hickman Family Polygonaceae Common Names close-flowered knotweed Eastern Washington Native Conservation Status Notes Click on any image to enlarge it.

Scientific Name Polygonum douglasii Greene Family Polygonaceae Common Names Douglas’ knotweed, Douglas’s knotweed Eastern Washington Native Conservation Status Notes Click on any image to enlarge it.

Scientific Name Polygonum majus (Meisn.) Piper Family Polygonaceae Common Names Palouse knotweed, wiry knotweed Eastern Washington Native Synonyms None Conservation Status Notes Click on any image to enlarge it.

Scientific Name Polygonum polygaloides Wallich ex Meisn. ssp. polygaloides Family Polygonaceae Common Names Polygala knotweed Eastern Washington Native Conservation Status Notes Click on any image to enlarge it.

Scientific Name Polygonum aviculare L. Family Polygonaceae Common Names yard knotweed, common knotweed Eastern Washington Introduced Synonyms 4 subspecies Conservation Status Notes Click on any image to enlarge it.