Size: 1.0 - 1.2 inches wingspan
Key ID features: Male brilliant silvery-blue above, with narrow dark wing borders, white fringes, often with marginal row of small black spots. Female gray-brown with some blue scaling. Below gray or blue-gray, with bold median row of round black spots with white rims, and lighter discal cell end bars on FW and HW.
Similar species: Boisduval's Blue has variable submarginal markings on HW and FW below.
Host plant: Lupine species (Lupinus).
Habitat: Moist, open areas near lakes, streams and wetlands.
Range: All of Oregon except north coast.
Season: Mid-March to early September
Conservation Status: Secure