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Color photo of Columbian Blue butterfly

Gert Canyon, Wasco Co, May 4

Columbia Dotted Blue

Euphilotes columbiae

AKA Columbian Blue

Size: Up to 0.85 inch wingspan

Key ID features:  Small.  Male blue above with dark wing borders. Female dark brown above with vague orange zigzag along trailing margin. Both sexes have checked fringe on FW. Below yellowish-gray with bold black spots, and orange edges to submarginal black spots on HW.

Similar species: Best told from other Euphilotes blues by host-plant association, location and flight period.


Host plant: Eriogonum elatum (tall woolly buckwheat), E. compositum (arrowleaf buckwheat), and E. strictum (Blue Mtn buckwheat).

Habitat: Well-drained sites where hostplant grows, including high plateaus, ridges, gravelly slopes and roadsides. ​

Range: Columbia and Snake River basins in NE Oregon.

Season: Mid-April to late June

Abundance: Common


Conservation Status: Secure

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