Herbaceous and deciduous vines, ca. 3 m or longer. Stems and branches purplish brown when dry, longitudinally striate. Petiole subequal to or sometimes much longer than leaf blade; leaf blade triangular-rotund, length and width 8-15 cm, softly papery, black or grayish brown when dry, both surfaces glabrous, base subtruncate or rounded, margin entire to sparsely dentate, apex mucronate, sometimes obtuse with a finely mucronate acumen, palmately 10-or 11-veined, together with reticulation conspicuous on both surfaces, relatively more conspicuous abaxially. Inflorescences compound umbelliform cymes, usually axillary or sometimes on short axillary branches. Male peduncle 2.5-5 cm; umbellet pedicels 5-10, ca. 1(-2) cm; bracts linear-lanceolate. Male flowers: sepals 6 in 2 whorls, light yellow, outer whorl 3, oblanceolate to obovate, ca. 1.5 mm, inner whorl rhomboidal, 1.5-1.7 × 1.2-1.5 mm, base abruptly clawed below middle; petals 3, greenish yellow, broadly cuneate, ca. 0.7 × 0.8-1 mm, inside with 2 glands; synandrium ca. 0.7 mm, anthers usually 6. Female inflorescences with peduncle 3-7 cm; umbellet pedicels up to more than 10, 3-4 mm, fleshy, black when dry. Female flowers: sepal 1, minute; petals 2, broadly ovate-rounded, ca. 0.6 mm; carpel glabrous. Drupes with pedicel fleshy, red; endocarp broadly obovate, ca. 6 mm, with columnar tubercles apically swollen and capitate. Fl. Jun-Jul, fr. Sep-Oct.
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