Herbs, scandent. Stem slender, angular-sulcate, sparsely puberulent. Petiole 3.5-5 cm, pubescent and sparsely setose; leaf blade ovate-cordate, 8-11 × 5-5.6 cm, papery or submembranous, abaxially sparsely pubescent and setose, adaxially densely setose at first, ultimately punctate-scabrous, basal lateral veins along margin of sinus, base emarginate, margin callose-dentate, apex shortly acuminate. Tendrils simple, pubescent. Male flowers in a raceme; peduncle robust, 8-24 cm; bracts ca. 2 × 2.2 cm, margin irregularly 5-or 6-obtusely dentate; pedicel slender, 7-10 mm, sparsely pubescent; calyx tube campanulate, ca. 2.5 × 3.5 mm; segments ca. 10 × 11 mm, 3-veined, margin irregularly 3-5-dentate; corolla segments narrowly oblong, 8-9 × 3-3.5 mm, apex acuminate; filaments ca. 1.5 mm, sparsely pubescent; anthers oblong, ca. 3 mm; rudimentary ovary subglobose, ca. 2 mm in diam. Fruit solitary, subcylindric, ca. 3.2 × 2 cm, longitudinally striate, rounded at apex and base.
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