Glaucopsyche piasus, the Arrowhead Blue, can be found in WA,OR,ID,WY,CA,NV,UT,AZ,NM,SD, and NE.
Favorite nectar plants include: Phacelia
USDA Growing Zones for this plant include: 3,4,5,6,7,8,9,10

Host plants:
Astragalus
Lupinus
Lupinus albifrons
Lupinus argenteus
Lupinus caudatus
Lupinus excubitus halli
Lupinus hirsutissimus

CC0 image courtesy of
Alan Schmierer