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North American Ecology (US and Canada)Resident in western North America (Scott 1986). Habitats are OPEN AREAS. Host plants are usually herbaceous with hosts including many species, but mostly in one family, Cruciferae. Eggs are laid on the host plant singly. Individuals overwinter as pupae. There is a variable number of flights each year with the approximate flight time MAY1-JUN30 in the northern part of the range and MAR1-APR30 in the southern part of their range (Scott 1986). Considered as Euchloe ausonia by some sources (Scott 1986).