Annual erect plant, up to 2 m in height.  Leaf with three membranous leaflets, oval to ovate, 6 to 12 cm in length.  Flowers, 10 to 20 in number, pink, in peduncles.  Pod (fruit) linear, slightly curved, up to 30 cm in length, with three longitudinal ribs in each valve.  Ellipsoid seeds, approx. 2 cm in length, white with a brown mark.