Vines, to 10 m; stems moderately to sparsely hirtellous or strigillose to glabrous, drying yellowish brown. Leaves opposite; petiole 1-3 cm, hirtellous or strigillose to glabrescent; blade drying membranous, ovate, lanceolate, or narrowly lanceolate, 5-16 × 2-10.5 cm, adaxially glabrous or puberulent on principal veins, abaxially sparsely hirtellous to glabrous on blade and sparsely to moderately puberulent or hirtellous along veins, base rounded to truncate or cordate, margins flat, apex acute to weakly acuminate; secondary veins 4-8 pairs; stipules generally persistent, ovate-lanceolate to broadly triangular, 2.5-6 mm, acute or bifid. Inflorescences axillary and/or terminal, paniculate, pyramidal, 6-50 cm, branched to 3-5 orders, hirtellous to glabrescent, pedunculate; bracts triangular to linear, 0.5-2 mm; pedicels to 2 mm. Flowers subsessile to pedicellate in cymules. Calyx puberulent to glabrescent; hypanthium portion ellipsoid, ca. 1 mm; limb lobed nearly to base; lobes triangular, 0.4-2 mm. Corolla purplish blue, lilac, or pink, funnelform, outside densely puberulent to tomentulose; tube 6-16 × 1.5-4.5 mm, without slits; lobes triangular, 2-4 mm. Fruit broadly ellipsoid to ovoid, somewhat laterally compressed, 6-11 × 4.5-8 mm, glabrescent, drying yellowish gray; pyrenes ovate to elliptic, somewhat flattened, marginally winged. Fl. May-Jun, fr. Nov-Dec.
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