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Color photo of Arrowhead Blue butterfly

Gert Canyon, Wasco Co, May 4, female


Glaucopsyche piasus

Size: 1.0 - 1.25 inches wingspan

Key ID features:  Noticeably larger than most blues. Violet-blue above, with dark wing borders, white checked fringes. Below brownish-gray, HW with white arrows pointing toward median band of black spots.

Similar species: No other Oregon blue has white arrows on HW below pointing toward body.


Host plant: Lupine species (Lupinus)

Habitat: Open areas with lupines in sage-steppe, ponderosa pine stands, canyons and wet meadows. ​

Range: Most of Oregon east of the Cascade Range and in SW Oregon.

Season: Early April to late August

Abundance: Common


Conservation Status: Secure

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