Herb 120-600 mm tall, erect, sparingly branched; stems triangular in cross-section, sericeous, becoming glabrous. Leaves sparsely sericeous; leaflets oblanceolate to narrowly obovate, 20-60 x 3-8 mm, apex acute, apiculate; petioles 6-20 mm long on lower leaves, 2-3 mm long above; stipules lanceolate, 8-16 x 0.5-2 mm. Inflorescence racemose, rarely pseudoumbellate, often lax, 1-7-flowered, terminal, becoming leaf-opposed; peduncle 5-50 mm long; bracts narrowly ovate to lanceolate, 5-8 x 0.5-0.75 mm, bracteoles narrowly ovate to linear, 3-6 mm long. Calyx sericeous, deeply bilabiate; upper lip 8.5-11 mm long, lobes 5-6.5 mm long; lower lip 10-12 mm long, lobes 4-5.5 mm. Corolla yellow; standard with black flecks in the medial basal region, broadly obdeltoid, 9-12 x 11-13 mm, adaxial surface sparsely sericeous, base canaliculate, claw 2-3 mm long; wings oblong to obovate, 9-11 x 3-6 mm, with lunate-lamellate sculpturing in the basal and upper central zones, claw vertical, 2-2.5 mm long; keel acutely cymbiform, 7-8 x 4-5 mm, claw vertical, 2.5-3 mm long. Stamens monadel-phous, sheath completely fused above. Ovary 4-5 mm long, often laterally glabrous; style 3-4 mm long. Fruit sericeous, compressed (only immature fruits seen). Seed not seen.
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