Calycocarpum (cupseed) is a monotypic genus of flowering plants in the family Menispermaceae. The only species currently accepted is Calycocarpum lyonii endemic to the southeastern United States.Flora of North America vol 3
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 .Flora of North America vol 3Correll, D. S. & M. C. Johnston. 1970. Manual of the Vascular Plants of Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson
Calycocarpum lyonii is a vine climbing over other vegetation, often to the tops of tall forest trees. Leaves are broad, pentagonally lobed, up to across and long. Flowers are borne in racemes or panicles up to long. Drupes are green, drying black, spherical to ellipsoid, up to long.Gray, Asa. 1848. Genera Florae Americae Boreali-Orientalis Illustrata 1: 76.Pursh, Frederick Traugott. 1814. Flora Americae Septentrionalis 2: 371.Wunderlin, R. P. 1998. Guide to the Vascular Plants of Florida i–x, 1–806. University Press of Florida, Gainesville.Southeastern Flora, Calycocarpum lyoniiSperry Herbarium Common Woody Plants of southeast Kansas, Calycocarpum lyonii
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