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North American Ecology (US and Canada)Resident in western North America (Scott 1986). Habitats are DESERT TO PINE FOREST. Host plants are usually herbaceous with most known hosts largely restricted to a few species in one family, CRUCIFERAE. Eggs are laid on the host plant singly. Individuals overwinter as pupae. There are is one flight each year with the approximate flight time MAY15-JUN30 in the northern part of the range and FEB1-MAY30 in the southern part of their range (Scott 1986). Listed as Pieris sisymbrii by Scott (1986).