Voltinism-gradient
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Euphyes dukesi
Dukes' skipper
Euphyes dukesi, known as Dukes' skipper, is a small wetland-associated skipper butterfly endemic to eastern North America. The species exhibits a fragmented distribution across three geographically isolated populations: the Atlantic coastal plain, the lower Mississippi Valley, and the Great Lakes region. It is strictly associated with shaded wetland habitats where sedges serve as larval host plants. The species was first described in 1923 from Alabama and named for collector W. C. Dukes. Two subspecies are recognized: the nominate form and the Florida-endemic E. d. calhouni, which occupies swamp habitats with distinct morphological differences.