Stems twining, to 15 m, terete, densely brown or reddish brown tomentose. Leaves broad-to narrow-ovate, 6.5-15 by 4-10 cm, broadly cordate or rarely truncate at the base, shortly acuminate to cuspidate at the apex, with an acute or obtusish, mucronulate acumen, tomentose on both sides, below more densely and more softly than above, the upper surface glabrescent, at last sometimes glabrous; lateral nerves 5-6 on either side of the midrib; petiole 18-35(-60) mm, tomentose like the stem. Peduncles axillary, terete or more or less applanate at the apex, variable in length, 4-14 cm, tomentose. Flowers in a 2-5-flowered umbelliform cyme. Pedicels variable in length, 4-15 mm, short-tomentose. Bracts at the base of the primary branches of the cyme small, or larger and leaf-like, and then to 2 cm long. Sepals about equal in length or the inner ones a little shorter, 8-14 mm long, short-tomentose; two outer sepals ovate or ovate-oblong, mostly with a waved or reflexed margin; three inner ones broadly ovate, all acute to acuminate, herbaceous, the inner ones with narrow scarious margins. Corolla campanulate to funnel-shaped, 3-4(-5) cm long, white, often bluish in dry specimens, midpetaline bands pilose outside, otherwise glabrous, inside glabrous or with a few hairs below the base of the filaments. Filaments sparsely pilose near the base; anthers directed downwards. Ovary hairy; style bifid, with a few hairs near the base; stigmas globose-peltate. Capsule broad-ovoid to subglobose, ca 12 mm high, hairy at the apex, 2-celled, 4-valved, the valves longitudinally splitting into several narrow segments, which are often connate at the top. Seeds 4, glabrous, black, 5.5-6 mm long, with 1 convex and 2 plane sides.
Edges of secondary forests, thickets, hedges, waysides, riverbanks, from sea-level to ca 250 m, rarely up to 600 m.
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