Vines; stems herbaceous, pubescent to-glabrate. Leaves ovate to broadly ovate, 3-6 cm long, basally cordate, apically acuminate, glabrate. Inflorescences dense cymes on peduncles mostly longer than the leaves, mostly 1-2-flowered at any time. Flowers with the sepals ovate to lanceolate, acute to acuminate 4-5 mm long and 2-4 mm wide, pubescent; corolla mostly blue, sometimes white, 2 cm long, interplicae glabrous; stamens slightly unequal, the filaments glandular pubescent; ovary oblong, glabrous. Fruits capsular, globose, 4 mm in diameter, glabrous; seeds brown, 2.5 mm long, glabrous.