Climbers, annual, the herbaceous stems twining, glabrous. Leaves broadly ovate to orbicular, 7-18 cm long, cordate basally, acuminate apically with an acute to obtuse acumen. Flowers solitary to few-flowered cymes, the peduncles usually muricate. Sepals ovate to oblong, the outer 6-7 mm long with a fleshy-caudate awn, 4-6 mm long, the inner sepals 7-8 mm long, the awn shorter. Corolla nocturnal, lavender to purplish, 5-7.5 cm long, the tube 3-6 cm long, the limb funnel-shaped to salverform. Fruit capsular, ovoid, 1.8-2 cm long. Seeds ovoid, black, glabrous.