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Glaucon Blue

Sand Creek, Klamath Co, July 1


Euphilotes glaucon

AKA Glaucon Blue

Size: Up to 1.0 inch wingspan

Key ID features:  Small. Male blue above with narrow dark wing borders, little or no orange along trailing edge of HW. Female dark brown above with prominent orange zigzag along trailing margin. Both sexes have checked fringe on FW. Below bluish-gray with bold black spots, larger on FW, and broad, connected orange submarginal line on HW.

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


Host plant: Eriogonum umbellatum (Sulphur-flower buckwheat).

Habitat: Well-drained sites where host plant grows, including high plateaus, ridges and roadsides. ​

Range: North Cascades, Curry Co, Jackson Co, Josephine Co, Klamath Co, Deschutes Co, Harney Co

Season: Early May to mid-August

Abundance: Common


Conservation Status: Secure

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