Stems become waxy and somewhat angled with age. Cotyledons are bean-shaped, thick, dark green above and light green below. First true leaves are alternate and widest at the apex and tapering to the base. Leaves are without hairs on the upper surface and covered with appressed hairs on the lower surface. Alternate, approximately 2 to 6 inches long, widest at the apex and tapering to the base.
Leaves are without hairs on the upper surface and covered with appressed hairs on the lower surface.
Leaves occur on short petioles. Stipules also occur at the base of the petioles but usually persist only for a short time. Flower stalks have a distinctive bract at their base that is approximately 7 to 12 mm long and 5 to 9 mm wide. A legume that is 1 to 2 inches in length and takes on the appearance of an inflated cylindrical pod. Fruit turn brown to black when mature and the seed within the fruit often become unattached resulting in a 'rattlebox' sound when shaken.