Erect or rarely decumbent annual or short-lived perennial, up to 7 dm. tall, well branched, often mostly from near the base.. Stem appressed puberulous.. Leaves 3-foliolate; leaflets linear, or less commonly lanceolate or narrowly oblong, up to 25–75 mm. long, 3–10 mm. wide, glabrous above, appressed pubescent beneath; petiole 10–20 mm. long.. Stipules absent.. Racemes terminal and leaf-opposed, long-pedunculate, up to 4–15 cm. long, with few to many rather closely arranged flowers towards the top; bracts triangular or subulate-caudate, up to 1 mm. long; bracteoles inserted at the base of the calyx, filiform, up to 0·5 mm. long, or absent.. Calyx becoming basally truncate and deflexed against the pedicel, 3–4 mm. long, appressed puberulous; lobes triangular-acuminate, ± as long as the tube.. Standard suborbicular, yellow, veined reddish or purple, glabrous outside; wings shorter than the keel; keel rounded about the middle, with a slightly incurved attenuate-acute untwisted beak, 5–7 mm. long.. Pod sessile, cylindrical, up to 22 mm. long, 5–6 mm. across, appressed puberulous, ± 20–24-seeded.. Seeds oblique-cordiform, 2–2·5 mm. long, smooth or minutely punctate, pale yellow to grey.
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