Smith's blue butterfly, Euphilotes enoptes smithi, is an organism in the family Lycaeniae, which is also known as the "gossamer wing" family. This federally listed endangered species occurs in fragmented populations along the Central Coast of California, primarily associated with sand dune habitat and in one case with a dune-based Maritime Coast Range Ponderosa Pine forest in the Carbonera Creek watershed in Santa Cruz County. The range of E. enoptes is from Monterey Bay south to Punta Gorda.