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North American Ecology (US and Canada)Plebejus icarioides is the largest North American blue. Resident in somewhat patchy distribution over most of western United States and into southern Canada (Scott 1986). Habitats are transition to Hudsonian zone woods clearings, prairie and sagebrush. Host plants are shrubs restricted to species in one genus, Lupinus (Leguminosae). Eggs are laid on the host plant singly. Larvae eat leaves, flowers, fruits and young shoots, and are tended by ants. Individuals overwinter in leaf litter as second-stage larvae. There is one flight each year in most of the range, with the approximate flight time Jun15-Aug.15; in the southern part of the range April1-June 30; in Colorado plains there are two flights, late May-June30, and Aug1-early Sept. (Scott 1986).