Stems twining, terete, young parts densely pubescent to tomentose, adult parts glabrescent. Leaves ovate-oblong, ovate or broadly ovate, 6-18 by 3½-13 cm, rounded or cordate at the base, shortly to long-acuminate or caudate and mucronulate at the apex, more or less densely and softly pilose to tomentose on both sides, sometimes nearly glabrous above; nerves 7-9(-12) on either side of the midrib; petiole 2-5 cm, densely pubescent. Peduncles axillary, 2-14 cm long, one-to many-flowered, pubescent like the stem. Pedicels much shorter than or nearly as long as the sepals, elongated in fruit. Bracts lanceolate, acuminate, lower ones ca 1-2 cm long, pubescent on both sides. Sepals nearly equal in length, 7-8 mm long; two outer ones ovate to broadly elliptic, obtuse or mucronulate, pubescent to tomentose outside; sepal 3 broadly elliptic to orbicular, obtuse or truncate, with one glabrous margin; two inner sepals orbicular, emarginate, with two glabrous margins. Corolla 5-parted, lavender; lobes linear, ca 20 by 3-4 mm, densely sericeous outside towards the base, at the apex with 2 triangular glabrous lobules; tube ca 9 mm long, glabrous. Filaments with a tooth above the base, glabrous. Ovary glabrous, 2-celled. Fruit ellpsoid, up to 1½(-2) cm long, purple, at the base enclosed by the slightly enlarged sepals; seed 1, ellpsoid, 1 cm long.
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