Richardson's pondweed —  Potamogeton richardsonii {pondweed family — Potamogetonaceae}
Flora of the Yukon Territory, Cody, p. 058c
 { 1/30 sec, f29.0} – {Miles Canyon area, Whitehorse, Yukon} – {22/06/09 Monday, June 22, 2009; 4:43:00 PM}