Shrubs well branched, round, 1.5 m wide or scandent, up to 4 m tall; stems woody, grey, initially finely tomentose; root tubers ovoid to fusiform, rarely moniliform, up to 400 x 150 mm. Leaves ovate-rotund to cordate, 15-80 x 15-80 mm; adaxial surface rugose-bullate, minutely strigose, glands sessile, capitate, white; abaxial surface costate, densely tomentose, glands sessile, capitate, white; margin revolute, crenate, teeth in 6-14 pairs; petiole 6-65 mm long. Synflorescence verticillate, cymes three-flowered; coetaneous with leaves, terminal or axillary, paniculate, with two to four basal side branches, seldom simple; bracts trullate to ovoid-deltate, 4.5-6.0 x 2.5-3.0 mm, imbricate above, caducous below; abaxial surface sparingly tomentose, dotted with white glands. Calyx sessile, 1.5-2.0 mm long, elongating to 4 mm in fruit, filiform trichomes erect, dense, glands white, capitate; tube 0.5 mm long; dorsal sepal ovate, 0.75-1.00 x 0.5 mm; lateral sepals fused, lobes deltoid, 0.5 x 0.5 mm; abaxial sinus 1 mm deep. Corolla white, five-lobed, 3.0-3.5 x 3.0-3.5 mm, broadly funnel-shaped; base narrow, 0.5 mm wide; lobes rounded, often incurved, 1.0-1.5 mm long. Stamens 4, free, fertile or rarely abortive; filaments 4-5 mm long. Nectariferous disc with a single well developed lobe. Style white, filiform, 6.0-6.5 mm long; stigma bifid. Nutlets pale brown, narrowly ovoid, 1.5-2.0 x 0.75-1.0 mm.
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