common water-milfoil —  Myriophyllum sibiricum {water-milfoil family — Haloragaceae}
Flora of the Yukon Territory, Cody, p. 448a
 { 1/30 sec, f14.0} – {McIntyre Ck. college, Whitehorse, Yukon} – {14/08/10 Saturday, August 14, 2010; 2:37:35 PM}