Echinargus isola, the Reakirt's Blue, can be found in several states in the West, Midwest, and the South, and in Alaska.
Favorite nectar plants include: Acacia,Echinacea, Lantana, Medicago, Rudbeckia, and Trifolium
USDA Growing Zones for these plants include: 3,4,5,6,7,8,9,10

Host plants:
Medicago sativa
Trifolium
Vicia
Lupinus

CC0 image courtesy of
Alan Schmierer