Plants annual, the stems twining, pilose to hirsute with spreading trichomes. Leaves broadly ovate to cordate, 2-10 cm long, entire or trilobate, pubescent on both surfaces. Flowers in 1-5-flowered cymes. Sepals oblong-lanceolate, 8-16 mm long, apically abruptly acute, hirsute on the basal portion. Corolla purple, pink, blue or with stripes of these colours on a white background, throat white, 3-5 cm long. Fruit capsular, depressed globose, 10 mm long. Seeds black, pyriform, glabrous.