Photo courtesy Peter J. Bryant
Natural History of Orange County, California

Photo courtesy Janice Stiefel
In the town of Greenbush, Sheboygan Co., Wisconsin

Identification: The small butterfly is white, with one or two rounded black spots on the dorsal forewing. There will be a black patch at the apex of the forewing. The upper side is white; the underwide is mustard-like to greenish-yellow.

The caterpillar host plants are radish, cabbage, cauliflower, kale, and collard.