Marble-butterfly
Guides
Euchloe hyantis
pearly marble, pearly marblewing, California marble
A small Pieridae butterfly of western North America with distinctive marbled underwings. Adults fly in spring and early summer, with one generation annually. Males exhibit hilltopping behavior along ridgelines. The species has been documented feeding on Brassicaceae flowers and fruits, particularly Streptanthus species. Chrysalids overwinter.
Euchloe olympia
Olympia Marble
Euchloe olympia, the Olympia Marble, is a pierid butterfly native to central North America. It is distinguished from congeners by its distinctive phenotype and genotype, particularly in relation to E. guaymasensis. The species has been classified globally as G5/G4, indicating relative stability, though it faces threats from gypsy moth chemical control programs. A study in central Illinois documented consistent nectar source preferences: Lepidium virginicum for larvae and Nuttallanthus canadensis for adults.