Polygonum cascadense is a species of flowering plant in the buckwheat family known by the common name Cascade knotweed. It has been found only in the State of Oregon in the northwestern United States, in the Cascades and in the Blue Mountains.Biota of North America Program 2014 county distribution map
Description Polygonum cascadense is an herb with a green or red zigzag stem up to tall. It produces small groups of white flowers with red anthers.Flora of North America, Polygonum cascadense W. H. Baker, 1949. Cascade knotweed
References
External links Paul Slichter, The Knotweeds and Smartweeds of the Columbia River Gorge of Oregon and Washington, Cascades Polygonum, Polygonum cascadense photos Oregon Flora Image Project, University of Hawai'i photos