Sooty Azure, female ? AKA Dusky Azure
1/4 -- 1 1/4 inches (19-32 mm)
A profusion of these tiny butterflies seem to be around just now-- very hard to determine just which of the AZURES it is-- Spring, Appalachian, Dusky/Sooty--possibly a local variant ???
I think this one was laying eggs on Queen of the Prairie buds.
f 3.2, 1/200, 0ev, ISO 200