Original identification: Salix sitchensis
Current identification: Salix sitchensis
Photographer: James Duemmel
Date Photographed: April 29, 2020
Location: U.S.A., Washington, Whatcom County: Lake Terrell.
Elevation: 215 ft.
Coordinates: 48.8562° N, 122.6812° W
Phenology: Vegetative
Comments: As you rotate a leaf around its midvein, a flash of light will jump from one half the underside of the leaf to the other half.