Herb less than 1 m tall, the stem winged by decurrent stipules, strigose to pilose. Leaves unifoliolate, elliptic, lanceolate, narrowly lanceolate or linear, the apex acute or mucronulate, the base rounded to cuneate, 2.0-6.7 cm long, 3.5-15.0 mm broad, the margins entire, above glabrous or strigose to pilose, beneath strigose to pilose, the veins not evident; petiole 1.5 mm or less long; stipules inverted sagittate, winging the stem for more than one internode, causing the stem to appear continuously winged, the wings 0.5-1.0 cm broad, the nodal lobes 3-10 mm long. Inflorescences terminal or leaf opposed and terminal racemes, bearing 8-20 flowers; bracts linear or subulate, 3.1-4.0 mm long, persistent; ped-icels 3.5-6.0 mm long; bracteoles narrowly elliptic or subulate, 2.5-4.5 mm long, pilose, located on the base of the calyx. Flowers yellow, 9-14 mm long; calyx 9-13 mm long, the tube campanulate, the lobes 2-2.3 times as long as the tube, sericeous; corolla yellow, about 10-14 mm long, the standard 7-9 mm long, 7-12 mm broad, retuse, the wings 6-9 mm long, the claws 1.8-2.0 mm long, oblong obovate, oblique, the keel 8-12 mm long, the twisted beak short; stamens di-morphic, the long anthers 1.5-2.3 mm long, the short anthers 0.3-0.7 mm long; style with a pubescent stigma, sharply geniculate, 5.5-5.8 mm long. Legume inflated, 2.2-3.4 cm long, glabrous, black at maturity; seeds ca. 20, tan, brown or red brown, oblique cordiform, to 2.5 mm long.
Can be grown by seedlings. Seeds needs soaking.
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