Brassicaceae-host
Guides
Pontia occidentalis
Western White
Pontia occidentalis, commonly known as the western white, is a butterfly in the family Pieridae native to western North America. Adults have a wingspan of 38–53 mm and exhibit distinctive wing markings including lighter marginal forewing markings and gray-green veining on the underside. The species shows reduced flight activity in forest habitat compared to alpine meadow habitat. Larval host plants are members of Brassicaceae, with caterpillars feeding primarily on flowers, buds, and fruit.