Annual, branches prostrate or ascending, glabrous or pubescent. Leaf bifoliolate, petiole 6.0-20 mm long, leaflets 0.7-3.0 cm long, 3.5-10 mm broad, sessile, lanceolate, linear-lanceolate or linear, glandular punctate below, glabrous. Inflorescence a 3-12-flowered raceme, 2.5-10 cm long. Bracts foliaceous, up to 1.3 cm long, black dotted, completely enclosing the flower. Calyx 3.5-4 mm long, 2 upper teeth obtuse, united, ciliate above, 2 lateral teeth smaller, the lowest longest, acute, ciliate. Corolla 7-8 mm long. Fruit 1-6 jointed, joints c. 2.5 mm long, indehiscent, echinate.