Erect annual, up to 5–20 dm. tall, usually well branched.. Stem ribbed, covered with short appressed or sometimes spreading hairs.. Leaves 3-foliolate; leaflets very variable, narrowly oblong-lanceolate to broadly elliptic, up to 6–10·5(–15) cm. long and 1·6–3·2 cm. wide, glabrous to sparsely pubescent above, appressed pubescent beneath; petiole ± 2·5–7 cm. long.. Stipules absent.. Racemes terminal and leaf-opposed, pedunculate, up to 11–28 cm. long, with many closely arranged flowers; bracts long-caudate, expanded at the base, (3–)5–11 mm. long, persistent; bracteoles inserted at the base of the calyx, linear-caudate or filiform, 3–10 mm. long.. Calyx becoming basally truncate and deflexed against the pedicel, (5–)6–8 mm. long, appressed and often rather densely pubescent; lobes narrowly triangular-caudate, usually longer than the tube.. Standard obovate-orbicular, yellow, usually veined reddish-brown or purple, glabrous outside; wings longer than the keel; keel abruptly rounded about the middle, with a rather long slightly incurved untwisted beak, 10–12 mm. long.. Pod shortly stipitate, shortly cylindrical, (15–) 18–24 mm. long, 6–8 mm. across, pubescent, ± (20–)26–38-seeded.. Seeds oblique-cordiform, ± 3 mm. long, smooth, ochre.
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