Large, glabrous, perennial liana. Roots tuberÂous. Stems twining, rarely prostrate, hollow, becoming woody. Leaves ovate-cordate to orbicular in outline, 60-200 x 60-150 mm, base cordate or truncate, entire to shallowly lobed or palmately dissected beyond the middle; lobes 3-9, lanceolate to ovate, entire, apex acuminate to obtuse; petiole smooth or muriculate, 30-110 mm long. Peduncles terete to angular, cymoseÂly branched near apex, few- to many-flowered, 25-200 mm long; pedicels 9-25 mm long. Sepals equal or outer ones shorter, all suborÂbicular or outer ones narrower, obtuse, markedÂly convex, coriaceous, 6-12 mm long. Corolla funnel-shaped with spreading limb, 50-60 mm long, 60-70 mm wide, tube narrow below and then widening, reddish purple or mauve with darker centre. Capsule globose or ovoid, 12-14 mm long. Seeds black, 5-7 mm long, with ± 7 mm long whitish silky hairs. Flowering time January to May.