Vines, to 12 m; stems densely tomentose to glabrescent, drying dark brown. Leaves opposite; petiole 3.5-12 cm, densely tomentose; blade elliptic to oblong-elliptic, 8-20 × 4.5-15 cm, adaxially sparsely to moderately strigillose with pubescence denser on midrib, abaxially densely tomentulose, base cordate to subrounded, margins flat, apex acuminate; stipules caducous often by fragmentation, triangular, 4.5-8.5 × 2.3-5.5 mm, acute to bifid. Inflorescences axillary on main stems and/or terminal on lateral stems, paniculate, densely tomentulose, pedunculate. Flowers subsessile in small heads. Calyx densely tomentulose; hypanthium portion turbinate to subglobose, 1.6-2.5 mm; limb deeply lobed; lobes triangular to suborbicular, 1-1.4 mm. Corolla pale green, dull white, pink, reddish purple, or dark purple, funnelform, outside densely tomentulose; tube 15-17.5 × 3.5-4.5 mm, with slits at base; lobes broadly triangular, 2.7-4 mm, acuminate, marginally crisped. Fruit oblong-elliptic, laterally flattened, 9-15 × 7-9 mm, subglabrous, drying brown; pyrenes elliptic to ovate in outline, flattened, marginal wing 1-2 mm wide. Fl. Jun-Jul, fr. Aug-Feb.
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A climbing plant. It grows 10 m tall. The limbs are hairy. The leaves are large and oval. They are 5-15 cm long and 3-5 cm wide. There are thick hairs on the leaves. The flowering panicles are in the axils of leaves or at the ends of branches. The flowers are 1 cm long.
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