trembling aspen —  Populus tremuloides {willow family — Salicaceae}
Flora of the Yukon Territory, Cody, p. 213a
 { 1/180 sec, f8.0} – {Paddys Pond/Ice Lake, Whitehorse, Yukon} – {17/05/04 Monday, May 17, 2004; 2:41:42 PM}