Annual climbers, densely to scattered pubescent with large trichomes throughout. Leaves cordate-ovate, entire or 3-lobed, 4-15 cm long, basally cordate, apically acuminate to acute, pubescent. Flowers in 1-to few-flowered cymes. Sepals long-lanceolate, 20-30 mm long, abruptly narrowed and spreading or curved at least in fruit, usually with some long erect trichomes on the base. Corolla lavender to blue with a white centre in wild plants, varying to red or purple in cultivated races, 3-5 cm long. Fruit capsular, subglobose to globose, 8-10 mm long. Seeds pyriform, black.