Annual, with an erect stem up to 3–4·5(–13) dm. tall, developing rather numerous weakly ascending, straggling or procumbent laxly subdivided branches, particularly from near the base.. Branches slender, sparsely appressed or rarely slightly spreading pubescent.. Leaves 1-foliolate; leaflets mostly linear-lanceolate to lanceolate, up to 45–70 mm. long and 4–10(–15) mm. wide, or the lowermost sometimes shorter and elliptic, glabrous above, thinly appressed pubescent beneath; petiole up to 4–8(–11) mm. long.. Stipules filiform, 0·5–1·5 mm. long.. Racemes long and slenderly pedunculate, up to 9–24 cm. long, with ± 4–8 very laxly arranged flowers; bracts subulate-filiform, 1–2·5 mm. long; bracteoles inserted at the base of the calyx, filiform, 0·5–2 mm. long.. Calyx 3–4 mm. long, thinly appressed puberulous; lobes narrowly attenuate-triangular, usually a little longer than the tube.. Standard suborbicular, clear yellow, veined reddish-brown or purple and glabrous outside; wings obovate-oblong, longer than the keel; keel abruptly rounded below the middle, with a blunt or acute incurved beak, 4·5–6·5 mm. long, pale greenish-yellow, rarely with dark veins.. Pod practically sessile, subcylindrical, up to 11–24 mm. long and 6–8 mm. across, thin or thick-walled, thinly pubescent, ± (10–)20–26-seeded.. Seeds oblique-cordiform, ± 2·5 mm. long, rugulose, reddish-brown.
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