This Arrowhead Blue is Glaucopsyche piasus sagittigera from Lone Pine Canyon on the north side of the San Gabriels near Wrightwood. It uses Lupinus excubitus. April 18, 2009. Thanks to John F. Emmel for help finding this subspecies.

Another Arrowhead Blue hanging around the roadside Lupines on the same day.

Another view of Glaucopsyche piasus sagittigera from the same trip to Lone Pine Canyon. Note the great 'arrowheads' on this one.

Dorsal of the Arrowhead Blue, Glaucopsyche piasus sagittigera, same day. They don't spread their wings much, in my brief experience.

There were three eggs on this part of the stalk. This is what I first saw on this attempt to find this butterfly, and when I saw eggs I knew I'd see adults, which weren't yet flying when I visited this area a couple weeks earlier.