Tuber enlarged. Stem and branchlets filiform, sparsely pubescent, ultimately subglabrous. Tendrils apically 2-fid. Leaves pedately 5-7-foliolate; petiole 2-4 cm; leaflets oblong-lanceolate to narrowly lanceolate; median leaflets 6-12 × 2-2.2 cm; petiolule 2-4 mm. Male flowers: inflorescence peduncle and branchlets flexuous, 4-5 cm, densely pubescent; pedicel filiform; calyx segments 5, spreading, ovate-triangular, ca. 4 × 2 mm, apex acuminate; corolla pale yellow, rotate, 8-10 mm; segments spreading, obovate, ca. 5 × 4 mm; filaments ca. 2 mm. Female flowers solitary or few dichotomously cymose in leaf axils; pedicel 5-30 mm; ovary narrowly campanulate or conical, ca. 3 × 2 mm, densely white punctate. Fruit campanulate to conical, 2.2-4 cm × 13-18 mm. Seeds dark brown, irregularly orbicular, compressed, 4-6 × 4-5 mm, 2-3 mm thick. Fl. Jul-Sep, fr. Aug-Oct.
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