Perennial with several erect stems, up to 4·5–8·5 dm. tall.. Stem simple or shortly branched above, somewhat 4-angled and conspicuously ribbed, appressed puberulous.. Leaves shortly petiolate, 1-foliolate; leaflets varying markedly in shape up the stem, the basal ones elliptic-oblong and small, the middle ones elliptic or elliptic-oblong, ± 54–75 mm. long, 17–22 mm.wide, and with the upper ones narrowly lanceolate, 60–110 mm. long, 3–8 mm. wide, glabrous above, appressed puberulous beneath; petiole ± 4–13 mm. long.. Stipules absent.. Racemes lax, up to 10–22 cm. long, ± 6–20-flowered; bracts linear-lanceolate, up to 8 mm. long, caducous, or the lower ones often large and foliaceous, with a stalk up to 7 mm. long and a linear-lanceolate blade up to 36–74 mm. long, rather persistent; bracteoles towards the apex of the ascending pedicel, linear, up to 5 mm. long, caducous.. Calyx 10–13 mm. long, appressed puberulous; lobes narrowly triangular, nearly twice as long as the tube.. Standard sub-orbicular, yellow, turning brownish, glabrous outside; wings oblong-obovate, as long as the keel; keel abruptly rounded in the lower third, with a well-developed straight blunt untwisted beak, 17–20 mm. long, white lanate towards the upper margin.. Young pod shortly stipitate, cylindrical, glabrous; mature pod and seeds unknown.
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