This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
A high climbing vine, with large petioled palmately lobed leaves,' and greenish flowers in long narrow drooping panicles. Sepals 6, oblong, obtuse. Petals none. Stamens about 12, nearly equalling the sepals; anthers 2-celled. Pistils 3, narrow; stigma laciniate. Drupe oval or globose, the stone flattened and hollowed out on one side, the embryo cordate. [Greek, cup-fruit, in allusion to the cup-like stone.]
A monotypic genus of eastern North America.
Climbing to the tops of trees, glabrous or slightly pubescent. Leaves long-petioled, thin, very broadly ovate or nearly orbicular in outline, 5'-8' long, cordate with a broad round sinus, palmately 3-7-lobed, glabrous above, more or less pubescent on the veins beneath; lobes ovate or oblong, acute or acuminate, repand, dentate or entire; panicles axillary, 5'-10' long, loose; flowers 2" broad; drupe nearly 1' long, black, the stone toothed or erose along the margin of its lateral cavity; pistillate flowers sometimes containing abortive stamens.