Vines, to 5 m; stems densely hirsute to hirtellous becoming glabrescent, drying brownish gray. Leaves opposite; petiole 1.5-8 cm, moderately to densely hirsute, hirtellous, or pilosulous; blade drying papery to subleathery, ovate-elliptic or lanceolate, 6-22 × 3.5-12 cm, adaxially sparsely hirtellous or hispidulous to glabrescent, abaxially densely pilose to hirtellous or tomentose, base cordulate to cordate, margins flat, apex acute to acuminate; secondary veins ca. 8 pairs; stipules caducous, triangular to lanceolate, 9-25 × 5-13 mm. Inflorescences terminal on lateral stems and/or axillary on main stems, paniculate, pyramidal to cylindrical, 8-20 cm, branched to 2-4 orders, densely hirsute to hirtellous or pilosulous, pedunculate; bracts linear to triangular. Flowers subsessile. Calyx densely pilosulous to hirtellous; hypanthium portion ellipsoid, 1-1.4 mm; limb lobed for ca. 1/2; lobes narrowly lanceolate or linear-lanceolate, 0.5-0.8 mm. Corolla grayish purple to pink, funnelform, outside densely puberulent or scabridulous; tube 4.5-9 × 1.2-1.5 mm, without slits; lobes ovate-elliptic, 1.5-2.5 mm, acute to minutely trifid, margins crisped. Fruit brown, ellipsoid to ovoid, laterally somewhat compressed, 5-7 × 5-6 mm, sparsely to moderately pilosulous to hirtellous to glabrescent; pyrenes ovate to elliptic in outline, flattened, marginal wing 0.8-1 mm wide. Fl. Jun-Jul or Oct-Nov, fr. Dec-Jan.
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