Small procumbent annual up to 0.1 m high and 0.2 m wide. Branches slender, spreading from a very short main axis; twigs sparsely pilose. Leaves digitately trifoliolate, sparsely pubescent, variable in size, those on the main axis with long and slender petioles, those of lateral twigs with the petiole 3-6(-8) mm long; leaflets oblanceolate to elliptic, (3-)5-10(-14) x (1-)2-2.5(-3) mm, abaxially sparsely pubescent, adaxially glabrous. Stipules consistently present, single at each node, oblanceolate to elliptic, 2-4 mm long. Inflorescences leaf-opposed at each node, fasciculate, 1-3-flowered; peduncle very short or absent; bracts small, up to 2.5 mm long, often inserted slightly above the pedicel base; bracteoles absent. Flowers very small, narrow, 6-7 mm long, yellow; pedicel short, up to 2 mm long. Calyx almost as long as the corolla, with the lateral lobes on either side fused much higher up in pairs, sparsely pubescent; lobes long and slender. Standard oblong-ovate, 6-7 mm long; claw 1.5-2 mm long; lamina acute, densely pubescent on the dorsal surface. Wing petals narrowly oblong, slightly shorter than the keel, pubescent towards the rounded apex; sculpturing in 3-4 rows of transcostal lunae fading into a few transcostal lamellae towards the auricle. Keel petals oblong, obtuse, auriculate and pocketed near the base, pubescent along the lower edge of the lamina. Anthers dimorphic, basifixed anthers more than 2 x longer than the dorsifixed anthers, carinal anther intermediate in size. Pistil 5-6 mm long; ovary oblong, ±3 mm long, densely pubescent; style short, almost straight. Pods oblong, compressed, slightly falcate, twice as long as the calyx, 8-12 x 2-3.5 mm, gradually tapering to the acute apex, ±6-seeded, upper suture ± smooth, indehiscent or tardily dehiscent, inconspicuously pubescent. Seed suborbicular in side view, up to 1.8 mm long; funicles up to 2 mm long; testa brown, often yellowish brown mottled with black, distinctly tuberculate.
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