The groundnut is a tuber of a widely distributed climbing plant, common in low, wet grounds, almost everywhere, from Canada to Florida, and westward to the Mississippi. This plant is described in most of the botanical works of the present day under the name of Apios Tuberosa, and belongs to the Pulse family (Leguminoseae). It is a perennial twining vine, with pinnate leaves and dense racemes of small, brownish-purple, pea-shaped flowers. The subterranean rootstocks bear long strings of edible tubers, which are round, some as large as walnuts, and some a great deal larger. They are dark-brown on the outside, but white within. When boiled or roasted, they have a rich, farinaceous, nutty flavor.