blue butterfly on Engelmann's aster

August 11, 2021 • Yellow Aster Butte Trail, Mt. Baker Wilderness • Whatcom County, Washington

Coordinates: 48.95099,-121.67349 (click for map)
blue butterfly on Engelmann's aster (Eucephalus engelmannii (Aster engelmannii)) [Yellow Aster Butte Trail, Mt. Baker Wilderness, Whatcom County, Washington]
Filename: 20210811-180534.jpg 2827x3769 pixels, ISO 400, f5.6 @ 1/160 sec
Eucephalus engelmannii (Aster engelmannii)

The butterfly is either a western azure (Celastrina echo) or an Anna's blue (Plebejus anna).

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