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Close-up photo of adult Silvery Blue butterfly

W Boundary Rd, Lane Co, April 28, male


Glaucopsyche lygdamus

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

Abundance: Common


Conservation Status: Secure

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