Tuber enlarged. Stem usually thickened at nodes, densely pubescent, ultimately glabrous. Tendrils glabrous. Leaves pedately 5-7-foliolate; petiole 2-6 cm; leaflets broadly lanceolate to rhombic, margin serrate or crenate, median leaflets 7-11 × ca. 2.5 cm, lateral leaflets smaller; petiolule 2-4 mm. Inflorescence peduncle and branches filiform. Male flowers: pedicel 5-10 mm; calyx segments ovate, ca. 7 mm; corolla pale yellow to pale yellow-green, rotate to bowl-shaped, 12-13 mm in diam.; corolla segments spreading, broadly obovate, ca. 8 × 7.5 mm, apex obtuse; filaments less than 1 mm. Female flower unknown. Fruit oblong-claviform or claviform, 4-5.5 × 0.6-1.7 cm, densely pubescent when immature, glabrous when mature, with indistinct ribs. Seeds dark brown, oblong, ca. 14 × 15 mm, 3-4 mm thick. Fl. Jun-Oct, fr. Aug-Nov.
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