Annual, 30-100 cm., green or scurfy-canescent, glabrescent or almost glabrous. Stems branching, with horizontally spreading or ascending lateral branches. Leaves mostly alternate, rhombic-hastate to deltoid, sometimes cuneate at base, entire or slightly sinuate, the lower up to 10 x 5 cm., the upper lanceolate-hastate to lanceolate-linear, acute-mucronate. Flowers (male and female) in interrupted inflorescences. Valves (in our plants) small, 1.5-3 mm., rhombic with pointed triangular tip and two long pointed teeth at base, con¬nate below middle or nearly so, with smooth or tuberculate surface. Seeds vertical, lenticular, 1-2.5 mm. in diam., black or dark brown. Fl. June-November.