Satyrium tetra, Mountain Mahogany Hairstreak

Mountain Mahogany Haistreak lives in the range of it's larval food, Cercocarpus. See Cercocarpus betuloides , Cercocarpus alnifolius, Cercocarpus minutiflorus.
A very nondescript little butterfly that you really do not notice. Usually it's on a flower and you take a picture of the other butterfly and catch this hairstreak in the photo.