A woody twiner, rarely prostrate and rooting. Stems longitudinally wrinkled to angular1, glabrous or pubescent. Leaves ovate to orbicular, sometimes ovate-oblong, 6-16 by 3½-14 cm, shallowly cordate to truncate at the base, acuminate at the apex with a short or long and narrow, acute or obtusish, mucronulate acumen; margin entire or undulate; surfaces glabrous or lower surface pubescent; nerves 10-15 on either side of the midrib; petiole slender, 3-10 cm, glabrous or pubescent. Inflorescences axillary; peduncle stout, 1-8 cm long, glabrous or rarely pubescent, cymosely one-to several-flowered. Pedicels 1-1½ (-2½) cm, in fruit to 3 cm, angular, thickened towards the calyx, glabrous or rarely pubescent. Sepals slightly unequal, glabrous or rarely pubescent, coriaceous, with pale thinner margins, orbicular with rounded apex; outer ones 7—10(-15), inner ones 10—12(-18) mm long, in fruit up to 14-15 and 18 mm or still longer. Corolla reddish purple with a darker centre, paler without, sometimes pale purple or rarely white, tubular to funnel-shaped, up to 10 cm long, contracted at ca 1½ cm above the base. Stamens and style included. Filaments hairy at the base. Ovary glabrous. Capsule ovoid, ca 1½ cm long, brown, 2-celled, 4-valved. Seeds 4, ca 8-9 mm long, black, with long silky hairs along the margins.
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