Erect annual or perennial, up to 1·5 m. tall.. Stem ribbed, densely pubescent with fine spreading brownish hairs.. Leaves 3-foliolate; leaflets elliptic, up to 25–70 mm. long, 8–20 mm. wide, acute or rounded at the apex, ± densely covered with rather irregularly arranged slightly spreading hairs on both surfaces; petiole up to 28–45 mm. long.. Stipules ± 1 mm. long, largely obscured by the stem-indumentum.. Racemes up to 15–25 cm. long, with many flowers crowded at least towards the top; bracts subulate-caudate, expanded at the base, 4–6 mm. long; bracteoles inserted at the base of the calyx, filiform, 2–3 mm. long.. Calyx becoming basally truncate and deflexed against the pedicel, 5–8 mm. long, finely spreading pubescent; lobes acuminately triangular, longer than the tube.. Standard suborbicular, bright yellow, glabrous outside; wings a little longer than the keel; keel rather strongly rounded about the middle, with a slightly incurved untwisted beak, 12–13 mm. long, lined and blotched red or maroon.. Pod subsessile, cylindrical, up to 25–27 mm. long, 6 mm. across, tomentose, ± 30-seeded.. Seeds oblique-cordiform, ± 2·5–3 mm. long, smooth, reddish-brown.
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