Herbaceous twiner, 1-3 m high; stems densely patently or retrorsely brown pilose. Leaves broadly ovate, 5-18 by 5-15 cm, deeply cordate at the base, acuminate and mucronulate at the apex; margin entire or irregularly dentate with one or more large teeth or shallowly to deeply 3-5-lobed, with acute or acuminate lobes; appressed-pilose on both sides, young leaves (occasionally also the adult ones) nearly tomentose with a golden-brown tomentum; petiole 2½-16 cm, hairy like the stem. Flowers in few-to many-flowered, axillary, cymose clusters, much shorter than the petiole. Peduncle short or absent. Pedicels up to 7 mm, glabrous or sparsely pilose. Bracts small, caducous. Sepals subequal or the inner ones a little shorter, ovate to lanceolate, acuminate or acute, 5-7½ mm long, herbaceous, with long patent hairs outside; not or slightly enlarged in fruit. Corolla urceolate, 12-15 mm long, white or yellowish white; tube inflated, contracted above, shortly hairy above and on the midpetaline bands of the limb; limb patent with 5 short lobes. Scales at the base of the filaments concave, papillose outside. Disk 5-lobed. Ovary glabrous. Capsule globose to ovoid, 6-8 mm high, mucronate, 4-or less-seeded. Seeds 3-4 mm long, glabrous, black.
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Sepals hirsute abaxially with ± erect, yellowish hairs. Ovary glabrous. Seeds glabrous.
Thickets, edges of secondary forests, waysides, occasionally in hedges, or as a weed in plantations, 25-1100 m.