Soft, fleshy, brittle-stemmed, glabrous, annual herbs. Stems up to 60 cm long, more or less decumbent, branched in the upper part. Cotyledons persistent, green, sessile, opposite, depressed-obovate, up to 15 cm broad and 7 cm deep. Leaves 4—12 cm long, 3-5-10 cm broad, ovate-cordate or subcircular, membra­nous, acute, cordate at the base, coarsely repand-dentate or subentire, petiolate, alter­nate or subopposite; stipules 2, minute, filiform. Raceme few-flowered. Sepals 4-5-5-5 mm long, 1-1-5 mm broad, narrowly oblong, membranous, very slightly cucullate; the inner two with a basal spur 1-2 mm long enclosing the large, ± tongue-shaped necta­ries. Petals 9-10 mm long, 1-8-2-5 mm broad, narrowly obovate, rounded, clawed. Filaments 1 • 6-1 • 8 mm and 2 ? 5-3 mm long, the 4 long ones ± widened at the base. Anthers 1-1 • 5 mm long. Ovary elliptic or obovate-elliptic; style short, stout. Siliquae 2-3 cm long, 5-5-5 mm broad, broadly lanceoloate or oblanceolate, ± compressed; valves membra