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North American Ecology (US and Canada)Euphyes vestris is a year round resident across the eastern United States and southeastern Canada to Alberta, and is also resident in a patchy distribution of separate populations across the western United States (Scott 1986). Habitats are moist areas and open woods. Host plants are sedges, largely restricted to one genus, Carex (Cyperaceae). Eggs are laid on the host plant singly. Individuals overwinter as third instar larvae. There is a variable number of flights each year depending on latitude, with one flight, mainly July1-July 31 in the northern and western part of the range and June 1-June 30 in California; two flights in Virginia-Montana and Texas, between May 1- Sept. 30, and multiple flights in Florida between March 1- Dec. 31(Scott 1986).