Vine, glabrous except sometimes with long trichomes along midribs of blades. Petioles 3-9 cm long; blades ovate-cordate, acuminate, 6-11 (15) cm long, 5-8 cm wide. Flowers in cymose, axillary, pedunculate clusters; peduncles stout, to 6 cm long; pedicels 0.5-1.5 cm long; sepals 5, ovate, ca 1 cm long, acuminate, glabrous (or 1 pubescent), 1 sepal often curling around ovary after flower falls; corolla 4.5-5.5 (6) cm long, lavender to whitish outside, red-violet on tube inside, the rim broadly flaring, the lobes 5, minute, apiculate; stamens 5, all of different lengths, 1.5-2.5 cm long; filaments pubescent, fused to tube near base; anthers opening in bud; style slightly exceeding stamens; stigma lobed, the lobes 2, hemispherical. Capsules +/- globose, 6-10 mm diam, splitting into 4 valves; exocarp thin; seeds 4, dark brown, glabrous. Croat 6869, 7002.