PrecolumbianCucurbita argyrosperma ssp.argyrosperma (Cucurbitaceae) in the Eastern Woodlands of North America

Abstract

Peduncles ofCucurbita argyrosperma ssp.argyrosperma are present in collections of desiccated archaeological plant remains from at least seven prehistoric Ozark rockshelter sites. A radiocarbon date (Accelerator Mass Spectrometer method) on a fragment of one of these fruiting stems has a two-sigma calendric date range of A.D. 1280-1490. One C.argyrosperma ssp.argyrosperma peduncle excavated from the Cahokia site in Illinois was among contents of a sub-mound pit deposited during the 11th century A.D. Therefore, cushaw-like squashes were present in eastern North America before European contact, contrary to the long-held belief thatCucurbita pepo was the only prehistoric squash species in the region. Landraces of eastern North American cushaws were isolated from their Southwestern and Mexican argyrosperma progenitors for a longer period of time than previously believed.