Description
The Large Marble (Euchloe ausonides) is a medium-sized butterfly with white wings adorned with green marbled patterns on the undersides and black markings on the forewings, commonly found in open grasslands, meadows, and sagebrush areas across western North America. The photos above are from Colorado.
Range
Very uncommon in the northern counties along the Canadian border.
Similar Species
Olympia Marble but the two species don’t overlap in range
Host Plants
Cresses (Cardamine spp.), Rock Cresses (Arabis spp.)
Flight
Late-May and June