This ill-named, slender, sparingly branched climbing vine grows from one to eight feet in length. It is common everywhere in moist thickets and rich, damp woodlands during August and September. Three pointed, egg-shaped leaflets compose the compound leaf. They are smooth, thin, toothless and short stemmed. The delicate, light green alternating leaves are slender stemmed. The butterfly-shaped flowers are gathered in small, drooping, short-stemmed clusters, at the leaf angles. They are purplish or lilac, and precede the numerous small, hairy pods containing several mottled brown seeds. Rudimentary flowers are also borne on very slender, creeping stems at the base or root of the vine and ripen their fruit beneath the surface of the ground in the form of fleshy, pear-shaped pods. Pigs are notorious rooters after these subterranean Peanuts, and consequently country people began to know this graceful, twining perennial as the Hog Peanut. It is found from New Brunswick to Florida, west to Lake Superior, Nebraska, and Louisiana.