Herbs; rhizomes brown or black, zigzag. Stems annual, climbing, branched, 2–3 m, herbaceous, glabrous; prickles absent. Leaves evenly distributed, proximalmost reduced to bracts; petiole shorter than blade; tendrils numerous, long, functional; blade dark green, triangular, ovate, or slightly hastate, 2.5–8.5 × 4–7.5 cm, membranous, glabrous and glaucous abaxially, base truncate, cordate, or hastate, lobes rounded; margins entire; apex cuspidate. Umbels axillary to leaves, staminate to 20-flowered, pistillate few–40-flowered, moderately dense, subspherical; peduncle of staminate umbel ± equaling subtending leaf, pistillate to 13.5 cm. Flowers: perianth light green; tepals 1.5–2 mm; anthers slightly shorter than to equaling filaments; ovules (1–)2 per locule; pedicel thin, ca. 1.5 cm. Berries blue, ovoid, 6–8 mm.
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