The [eastern] black swallowtail [Papilio polyxenes], also called the American swallowtail or parsnip swallowtail, is a butterfly found throughout much of North America. It is the state butterfly of Oklahoma.
The black swallowtail has a wingspan of 8 to 11 cm [3.1 to 4.3 in]. The upper surface of the wings is mostly black. On the inner edge of the hindwing is a black spot centered in larger orange spot. A male of this species has a yellow band near edge of wings; a female has row of yellow spots. The hindwing of the female has an iridescent blue band.