Tuber complanate-spheroid, 10-13 × 6-8 cm. Stem angular-sulcate, sparsely puberulent. Petiole 3-9 cm; leaf blade ovate-cordate, 5-13 × 4-10 cm, membranous, abaxially pilose, hispid on veins, adaxially scabrous, margin irregularly dentate or slightly 3-lobed, apex acute. Tendrils 2-fid. Male flowers: 8 in raceme; peduncle 4-6 cm; bracts broadly obovate, 5-6 × 3-4 mm, pubescent; calyx segments triangular-ovate or ovate, 5.5-8 × 3-5 mm, 3-veined, apex acuminate; corolla segments oblong, 10-13 × 7-8 mm, villous, 5-veined, base truncate, apex obtuse; filaments 3-3.5 mm; anthers curved, 3.5-5 mm. Female flowers solitary or paired; pedicel 1-1.5 cm, pubescent; ovary cylindric, ca. 10 × 4 mm, densely villous. Fruit cylindric, ca. 5 × 3.3 cm. Seeds numerous, ovoid or ovoid-oblong, 7-8.5 × 4.5-6 mm, ca. 1.5 mm thick.
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