Herbs, perennial. Stem erect or diffuse, much branched, 25-120 cm tall, glabrous or subglabrous. Leaves 1-foliolate; petiole ca. 2 mm or leaves subsessile; blade linear to linear-lanceolate, 4-7 × 0.4-0.5 cm, abaxially sparsely pubescent on midvein, adaxially glabrous, base rounded or cuneate, apex acute. Racemes terminal, 3-18 cm, 20-40-flowered, binate at each node; internodes 8-10 mm. Pedicel ca. 1 mm or flowers subsessile. Calyx 6-8 mm, longer than first article of legume; lobes lanceolate, ca. 2 × as long as tube. Corolla pale yellow or yellowish green, ca. 5 mm. Legume brown at maturity, 0.6-1.5 cm × ca. 1.8 mm, higher than calyx, 3-6-jointed, constricted between articles, glabrous. Fl. and fr. Sep-Nov. 2n = 16.
Deciduous, rain, evergreen and subhumid forests; also in wastelands, grasslands, field margins and sunny places in valleys. Often found in shallow water such as ponds, water-filled ditches and along canals; at elevations from 100-1,300 metres.
Can be grown by seedlings. Seeds needs soaking.
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