Calycocarpum

Calycocarpum (cupseed) is a monotypic genus of plants in the family Menispermaceae. The only species currently accepted is Calycocarpum lyonii endemic to the southeastern United States.

Calycocarpum lyonii has been reported from Texas, Louisiana, Oklahoma, Arkansas, southeastern Kansas, Missouri, southern Illinois, southern Indiana, Kentucky, Tennessee, Mississippi, Alabama, Georgia, northwestern Florida and southern South Carolina. It grows mostly along stream banks in deciduous forests at elevations less than 350 m.