[Butterflies of the Columbia River Gorge of Oregon and Washington]

The photo above shows the lower wing surfaces of an acmon blue as seen mudding along the banks of the lower Deschutes River about one-quarter mile upstream from its confluence with the Columbia River..........September 1, 2007.

Acmon blue on gray rabbitbrush (Ericameria nauseosa), east bank of the Deschutes River State Recreation Area, about a mile and a half upstream from the Columbia River...........November 12, 2017.