knotweed —  Polygonum aviculare {buckwheat family — Polygonaceae}
Flora of the Yukon Territory, Cody, p. 246b
 { 1/30 sec, f18.0} – {McIntyre Ck. college, Whitehorse, Yukon} – {15/08/09 Saturday, August 15, 2009; 3:03:38 PM}