Stems slender, hairy or nearly smooth, with milky juice, climbing over herbs and bushes to a height of several feet, from a perennial root-stock of several necklace-shaped, edible tubers. Leaves pinnately compound, five- to seven-foliolate; leaflets ovate to ovate-lanceolate, pointed at the apex, rounded at the base, 1 to 3 inches long. Flowers brownish purple, fragrant, about one-half of an inch long, in axillary racemes; peduncles shorter than the leaves; rachis of the inflorescence knobby; calyx two-lipped, the two lateral teeth very small, the two upper united and short, the lower one long and acute; standard ovate or orbicular and reflexed, wings obliquely obovate, adherent to the elongated, incurved and at length twisted keel; pod narrow, straight or slightly curved, 2 to 4½ inches long and about one-fourth of an inch wide or less, many-seeded and rather thick in texture.
Moist thickets along streams, bottomlands, or low woods. New Brunswick to Florida, west to Ontario, Minnesota, Nebraska, Kansas and Texas. Flowering from July to September.
Memoir 15 N. Y. State Museum
Groundnut; wild bean Glycine apios