knotweed —  Polygonum aviculare {buckwheat family — Polygonaceae}
Flora of the Yukon Territory, Cody, p. 246b
 { 1/80 sec, f5.6} – {Paddys Pond/Ice Lake, Whitehorse, Yukon} – {09/08/06 Wednesday, August 9, 2006; 2:07:25 PM}