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Climbers woody, with glabrous, sometimes verruculose axial parts. Stems twining or prostrate, to 20 m. Petiole 4.5-10 cm, scabrous; leaf blade broadly ovate, (3.5-)8-16 X (4-)7-13 cm, ± leathery, abaxially often pubescent, adaxially subglabrous, base shallowly cordate to truncate, margin entire, apex obtuse, acute, or short acuminate; lateral veins usually 11-14 pairs, prominent abaxially. Inflorescences paniculate, fundamentally cymose, 10-15 cm; peduncle 3-13 cm; basal bracts leafy; bracteoles early deciduous, ovate, 1-1.5 mm. Pedicel 7-10 mm. Sepals slightly unequal, glabrous; outer 2 broadly ovate, 3.5-5 mm, apex obtuse; inner 3 ± circular, 4.5-6 mm, apex broadly rounded or emarginate. Corolla lilac or greenish white, with a reddish purple tube inside, tubular-funnelform, 3-3.5 cm, glabrous. Stamens included, unequal; filaments inserted ca. 1.5 mm above base of corolla. Ovary conical, glabrous. Stigma 2-lobed. Capsule ovoid, 8-9 mm, apex ± acute. Seeds black-brown, ca. 4 mm, hilum with a tuft of long sericeous hairs.
