"Erect, annual herbs, up to 2.5 m high; stems densely pubescent with appressed hairs. Leaves alternate, 3-foliolate; leaflets 2.5-8.5 x 0.8-2.5 cm, linear-oblanceolate or obovate, sparsely adpressed pubescent on the lower surface, variable, the terminal usually slightly longer than the laterals; petioles 3.5-8.0 cm long; stipules oblong-falcate, 0.9-2.5 x 0.3-0.7 cm, acuminate, very unequal-sided. Racemes terminal, up to 6 cm long. Flowers many, crowded at the top; bracts subulate or filiform, 3-4 mm long, early caducous. Calyx 4-5 mm long, pubescent, lobes subulate triangular, more or less equal to the tube. Petals yellow; vexillum ovate, ca 0.9 x 0.6 cm, with prominent reddish vein, glabrous outside, slightly shorter than the keel; wing petals oblong, ca 1 x 0.3 cm; keel petals ca 0.9 x 0.5 cm, with a distinct straight beak and with a conspicuous band of hairs along the upper margins and not twisted. Pods subsessile, oblong-ellipsoid, 1.5-2.0 x 0.7-0.9 cm, thinly pubescent, blackish-brown; seeds 12-16, oblong-reniform, ca. 4 mm long, yellow, usually tinged orange red."