Erect annual, 60-125 cm tall. Stem pubescent and brown punctate. Leaf alternate, unifoliolate, petiole c. 2 mm long, rachis 1-4.5 cm long, lamina 3.7-7.5 cm long, 2.5-5.0 cm broad, cordate, subovate rarely ovate, margin dentate, tip obtuse, subtruncate, mucronate, pubescent and nigro-punctate on both sides, stipules lanceolate, persistent, 5-10 mm long. Inflorescence a peduncled raceme, peduncle 1.5-7.0 cm long, 3 flowers in the axil of each bract, bracts 2-3 mm long. Pedicel c. 1 mm long. Calyx bilabiate, upper lip 3-4 mm long, formed of 4 teeth, lower lip 4-5 mm long, formed of 1 tooth, pubescent and punctate. Vexillum 5-6 mm long. Fruit 4.5 mm, ovoid, glabrous, black, pitted, mucronate.
Flowering Period: Aug.-Dec.