Description: Yellow willow is common along Boulder Creek on the trail or road up to Boulder City. The lower surfaces of the leaves are distinctly lighter green in color compared to the brighter green upper surfaces. Date: 2 August 2019, 15:46. Source: Salix (lutea) eriocephala - yellow willow. Author: Matt Lavin from Bozeman, Montana, USA. Camera location43° 50′ 03.26″ N, 114° 29′ 40.28″ WView all coordinates using: OpenStreetMap 43.834238; -114.494523.