Polygonum aviculare   common or prostrate knotweed, doorweed
non-native                      herbaceous           
Distribution: Oregon Trail, Foothills, Conifer Zone, Greenbelt, Lucky Peak, South Boise, West Valley

UW Burke Herbarium Link: Polygonum aviculare
USDA Plants Link: Polygonum aviculare   (POAV)
Flora of North America Link: Polygonum aviculare

Bernice Bjornson had this this to say about the species in 1946:  “Knotwood or doorweed is a familiar weed, sometimes invading lawns, especially if they are not well watered, and forming mats even on dirt paths where it seems not to mind being trampled.  Its leaves are oblong to lance-shaped, acute at the end; its flowers are small, pinkish margined, usually one in every leaf axil toward the end of the branch.  “Aviculare”, the species name, means “small birds”.  Birds eat the seeds of knotweed.”

Trail guides, walks or articles that mention Polygonum aviculare