Columbia Dotted Blue
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
Conservation Status: Secure