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Annual or biennial herbs, erect, 0.6-1.5 m tall, sometimes prostrate or twining. Stems densely pubescent. Stipules lanceolate, 5-10 mm; petiole 0.5-5 cm; leaflets narrowly elliptic to ovate-lanceolate, 3-8 × 1-3.5 cm, abaxially densely pubescent or sparsely pilose, adaxially glabrous, sometimes slightly lobed, base cuneate, apex acute. Inflorescences with peduncles 15-40 cm, flowers paired in upper part of rachis. Calyx tubular-campanulate; teeth shortly triangular. Corolla purple-red; standard suborbicular, ca. 1.5 cm, with pale claw. Legumes linear, 5.5-10 cm × 2-3 mm, densely pubescent, 18-30-seeded. Seeds brown or with brown and black markings, obliquely oblong, ca. 3 mm.
Erect herb, later sprawling or sometimes twining; stems tough, slender, re-trorsely silver pilose on emerging, often glabrescent. Leaves pinnate trifoliolate; leaflets ovate or elliptical, mostly 2-4 cm long, 1.5-3.5 cm wide, apically obtuse, short acuminate or-acute, rarely rounded, basally deltoid, obtuse, or rounded; densely appressed pilose on emerging, soon glabrate; petiolules 1-2 mm long,
An erect herb. It grows 1.5 m high. It can grow each year from seed or take 2 years to complete its life cycle. The leaflets are narrowly oval and 3-8 cm long by 1-4 cm wide. They can be hairy underneath. The flower stalk is 15-40 cm long with flowers in pairs in the upper part. The pods are 6-10 cm long by 2-3 mm wide. They are hairy. There are 18-30 seeds. They are 3 mm across.
