A shrub; extremities smooth, shining, chestnut-brown. Stipular spines usually exceeding the leaves, slender, spreading, straight. Leaves small, puberulous or glabrate; pinnæ 1–2-jugate, leaflets 8–10-jugate, oblong, obtuse, midrib obscure, 1–1 1/2 lines long. Flowers capitate. Peduncles solitary or fascicled in the axils, exceeding the leaf, bearing the involucel near or below the middle. Petals united 2/3 their length, twice as long as the calyx. Legume narrow-linear, falcate, broadly constricted between the seeds, varying to 4 1/2 in. in length.