Stems smooth and twining or climbing over surrounding vegetation, 5 to 15 feet long, from a perennial root. Leaves opposite, ovate or hastate, deeply cordate at the base with rounded basal lobes, long pointed at the apex, somewhat triangular in shape, 2 to 4 inches long, 1 to 2 inches wide, borne on slender petioles. Heads in compound clusters, borne at the ends of the branches, each head four-flowered, surrounded by oblong involucres of four narrow bracts. Corollas white or pink.
Memoir 15 N. Y. State Museum
A. Climbing Hempweed Or Boneset - Mikania scandens