Twining liana, glabrous but the leaf blade below arachnoid-pubescent. Leaves alternate; petioles slender, ca 4-6 cm long; blades ovate, acuminate, truncate to shallowly cordate at base, 10-15 (20) cm long, 7-11(12) cm wide, grayish below with arachnoid trichomes. Flowers in short racemes of few flowers, white, densely speckled with pink and maroon; calyx expanded into a +/- campanulate balloon to 8 cm long, constricted into a short, reflexed tube opening into a large limb to 20 cm long; corolla lacking; stamens 6, the anthers sessile and adnate to style; styles 6, +/- connate; stamens capitate. Capsules cylindrical, to 13 cm long and ca 3 cm wide, dehiscing from base, bearing many seeds; seeds 7-8 mm long, flattened, elliptic, the margins bordering a prominent medial rib, very revolute, the dehisced valves ca 1.5 cm wide. Croat 11260, Shattuck 640.