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Plants densely pubescent-hispid. Roots tuberous. Stems herbaceous, angular-sulcate. Petiole stout, 3-10 cm; leaf blade ovate-cordate, broadly ovate-cordate, or suborbicular-cordate, 5-15 × 4-12 cm, abaxially densely pale yellow pubescent, adaxially densely setose, basal lateral veins along blade base, margin serrate, apex acuminate or acute; basal sinus open or sometimes closed, 2-2.5 cm deep, 1-2 cm wide. Tendrils densely hispid, 2-fid. Male raceme many flowered; peduncle filiform, 4-8 cm, densely pubescent; pedicels filiform, 1-1.5 cm; calyx densely villous; tube broadly campanulate, 5-6 mm in diam.; segments ovate-lanceolate, 5-6 × ca. 2.5 mm, 3-veined, apex acute; corolla segments ovate-oblong, 12-16 × 6-7 mm, 5-veined, apex acute or obtuse; filaments puberulent, ca. 4 mm; anthers ovoid-oblong, ca. 2.5 mm. Female flowers solitary; pedicels slender, 1-2 cm, villous; calyx and corolla as in male flowers; ovary narrowly oblong, 12-15 × 4-5 mm, densely villous-hispid, base obtuse-rounded, apex attenuate; style 3-fid; stigma enlarged, reniform, 2-lobed; staminodes 5, ca. 1.5 mm. Fruiting pedicel robust, 2.5-5.5 cm; fruit red or red-brown when mature, oblong, 4-5 × 3-3.5 cm, glabrescent, apex obtuse. Seeds ovate or broadly so, ca. 5 × 3.5-4 mm, 1-1.5 mm thick, reticulate, base rounded, apex acute. Fl. May-Aug, fr. Aug-Nov.
