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North American Ecology (US and Canada)Resident in western North America (Scott 1986). Habitats are DESERTS AND FOOTHILLS. Host plants are usually herbaceous or bushy with most known hosts largely restricted to a few species in one family, Cruciferae. Eggs are laid on the host plant singly. There are two to four flights each year with the approximate flight time APR1-SEP30 in the northern part of the range and MAR1-OCT31 in the southern part of their range (Scott 1986). Listed as a subspecies of Pieris chloridice by some sources (Scott, 1986).