This eastern tiger swallowtail was found in late July, preparing to pupate on an American Jointweed (Polygonella americana) at Sand Prairie Conservation Area in Scott County, MO.
Papilio glaucus (Eastern Tiger Swallowtail)
"What a thousand acres of Silphiums looked like when they tickled the bellies of the buffalo is a question never again to be answered, and perhaps not even asked." -Aldo Leopold
A Thousand Acres of Silphiums 