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North American Ecology (US and Canada)Resident in southern North America migratory to the north (Scott 1986). Habitats are OPEN AREAS, INCLUDING DESERT, PLAINS AND DISTURBED AREAS. Host plants are usually herbaceous including many species, but mostly in one family, Cruciferae. Eggs are laid on the host plant singly. Individuals overwinter as pupae. There are multiple flights each year with the approximate flight time MAR15-NOV30 depending on latitude (Scott 1986). Considered Pieris protodice by Scott (1986).