Erect or spreading annual or short-lived perennial herb, up to 80(–150) cm. tall. Leaf-rhachis up to 8 cm. long, including a petiole of under 1 cm., prolonged ± 3 mm. beyond the lateral leaflets; stipules narrowly triangular; leaflets 9–17(–21), elliptic-oblong, ± 2 cm. long and 6 mm. wide, truncate or rounded at the apex, shortly mucronate, sparsely striguloseto silky pubescent beneath; main nerves ± 7 on each side. Flowers reddish-purple or bright pink, in slender lax leaf-opposed pseudoracemes, a few also in the upper leaf-axils; bracts narrowly triangular, ± 4 mm. long; pedicels ± 4 mm. long, pubescent or strigulose. Calyx brown, appressed strigulose to spreading pubescent; tube ±1.5 mm. long; teeth narrowly triangular, the lowest ± 3 mm., others ± 2 mm. long, upper pair ± one-third united. Standard white pubescent outside, 6–9 mm. long and wide; keel glabrous. Upper filament lightly attached, widened, but not bent or callous, 1.5 mm. above the base; filament-sheath ± 6 mm., free parts ± 2 mm., anthers 0.3 mm. long. Style glabrous, linear, gently curved, ± 2.5 mm. long, not penicillate. Pod gently upcurved towards the tip, 4–4.5(–6) cm. long, ± 4(–6.5) mm. wide, shortly strigulose; distance between the centres of adjacent seeds greater than the width of the pod; pubescent style-base horizontal or gently downcurved. Seeds 6–9, mottled, longitudinal, subcylindrical, ± 3 mm. by 1.5 mm.; hilum central, hardly arillate.
