Plant: all parts with yellow-brown pubescence and black glandular scales. Root enlarged, fusiform or subglobose. Stem and branches slightly robust. Petiole 3-10 cm; leaf blade ovate-cordate, 12-23 × 5-17 cm, membranous, apex acuminate or long acuminate; sinus semicircular or broadly ovate-cordate. Male flowers: inflorescence racemose, 6-10-flowered; peduncle 7-13 cm; pedicels slender, 5-15 mm; calyx tube broadly campanulate, 4-5 × ca. 8 mm, usually with 3 membranous scales; segments triangular, ca. 4.5 × 3 mm, 3-veined, apex long acuminate; corolla yellow; segments oblong, 10-15 × 7-8 mm, 5-veined, apex acute; filaments puberulent, ca. 4 mm; anthers ca. 3 mm. Female flowers solitary or 2-5 on 6-8 mm peduncle; calyx and corolla as in male flowers but slightly larger; staminodes 2-2.5 mm; ovary oblong, 10-12 × 5-6 mm, densely yellow-brown velvety, base obtuse-rounded; style ca. 2.5 mm; stigmas 3, enlarged, ca. 1.5 mm. Fruit globose or oblong, 6-11 × 4-8 cm, densely yellow-brown velvety and black glandular-scaly, ultimately glabrous. Seeds numerous, pale yellow, broadly ovate, compressed, 15-18 × 10-12 mm, base obtuse-rounded, with 2-layered wings, wings sinuate. Fl. May-Jul, fl. Jul-Sep.