Stems twining, terete, densely short-pilose or the young parts tomentose, finally glabrescent and lignescent. Leaves ovate to broadly ovate, 4-8 by 3-7 cm, more or less deeply cordate or subtruncate at the base, attenuate to acuminate towards the acutish, mucronulate apex, densely short-pilose or the young ones tomentose on both sides, entirely green, or reddish beneath; nerves 7-8 on either side of the midrib; petiole 2-7 cm, shortly pilose. Inflorescences axillary, 1-flowered or cymosely branched, 2-4-flowered; peduncle ½-5 cm, in fruit up to 8 cm long, pilose like the stems. Pedicels (5-)10-18 mm, shortly pilose. Bracts minute, caducous. Sepals subequal in length or the outer ones slightly shorter, densely short-pilose to tomentose outside; two outer ones broadly ovate, elliptic or orbicular, shallowly ernarginate at the apex, 8-11 mm long, three inner ones broadly elliptic, ca 10 mm long, the margins fimbriate towards the shallowly emarginate apex; all sepals much enlarged in fruit, up to 3-3½ cm long. Corolla tubular to funnel-shaped, ca 5-6 cm long, violet, darker to the centre, the limb shortly pilose outside. Filaments shortly pilose at the base. Ovary glabrous. Capsule enclosed by the enlarged sepals, subglobose, ca 1½ cm diam. Seeds 7-8 mm long, shortly tomentose.
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