Size: 1.0 - 1.2 inches wingspan

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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.

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Similar species: Boisduval's Blue has variable submarginal markings on HW and FW below.

 

Host plant: Lupine species (Lupinus).

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Habitat: Moist, open areas near lakes, streams and wetlands. ​

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Range: All of Oregon except north coast.

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Season: Mid-March to early September

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Abundance: Common

 

Conservation Status: Secure