Annual, Herbs, Taproot present, Nodules present, Stems erect or ascending, Stems less than 1 m tall, Stems 1-2 m tall, Stems solid, Stems or young twigs glabrous or sparsely glabrate, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules green, triangulate to lanceolate or foliaceous, Stipules persistent, Stipules free, Stipules connate to each other, forming a tuber or sheath, Stipules cordate, lobed, or sagittate, Stipules toothed or laciniate, Leaves compound, Leaves even pinnate, Leaf or leaflet margins entire, Leaflets alternate or subopposite, Leaflets 10-many, Leaves glandular punctate or gland-dotted, Leaves viscid, sticky, Leaves glabrous or nearly so, Flowers in axillary clusters or few-floweredracemes, 2-6 flowers, Inflorescences racemes, Inflorescence axillary, Bracts conspicuously present, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx 2-lipped or 2-lobed, Calyx glabrous, Petals separate, Corolla papilionaceous, Petals clawed, Petals orange or yellow, Petals bicolored or with red, purple or yellow streaks or spots, Banner petal suborbicular, broadly rounded, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Keel abruptly curved, or spirally coiled, Keel petals fused on sides or at tip, Stamens 9-10, Stamens monadelphous, united below, Filaments glabrous, Style terete, Fruit a loment, jointed, separating into articles, Fruit stipitate, Fruit unilocular, Fruit indehiscent, Fruit elongate, straight, Fruit rugose wrinkled or reticulate, Fruit exserted from calyx, Fruit compressed between seeds, Fruit hairy, Fruit 3-10 seeded, Seeds reniform, Seed surface smooth, Seeds olive, brown, or black.
Annual undershrub, 30-90 cm tall, stem glabrous, branches terete with prickle-like glandular excretions. Leaf 3.5-9.0 cm long, rachis furnished with glandular excretions looking like prickles. Leaflets 21-71, alternate, subsessile, overlapping, 2.5-6.5 mm long, 1.2-2.0 mm broad, linear, obtuse, mucronate, glabrous. Inflorescence a 1-4-flowered axillary raceme, peduncle c. 2.5 cm long, peduncle and pedicel glandular, viscid, pedicel 5-9 mm long. Bracts c. 2 mm long. Calyx 6-7 mm long, bilabiate, glabrous, upper lip bifid, lower minutely 3-toothed. Corolla 9-10 mm long, yellow, vexillum veined with purple. Fruit 2.5-4.5 cm long, 3-5 mm broad, slightly curved, 6-10 jointed, glabrous or slightly hairy, readily separating into 1-seeded parts.