Climber to c. 5 m; stems yellowish, 3-7 mm diam., densely prickly. Leaves chartaceous, broadly ovate-lanceolate to elliptic, 5-nerved; lamina 7-22 cm long, 2.5-9 cm wide, dark green above, pale green below; petiole 25-45 mm long; stipules slightly inflated, without tendrils. Inflorescence simple or branched, axillary; pedicels 15-25 mm long. Flowers 5-7 mm diam., green, oblong in bud; sepals and petals 4-5 mm long, recurved. Male flowers: stamens 5-7 mm long; anthers 1-1.5 mm long. Female flowers: ovary ovoid, 2-3 mm long, glabrous; stigma minutely ciliate. Berry 6-12 mm diam., black. Seeds 1 or 2, subglobose or flattened, dark brown.
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