Herbs; rhizomes knotty, slender. Stems annual, erect, 2–5 m, herbaceous, glabrous; prickles absent. Leaves few, disposed distally or evenly distributed, subequal; petiole shorter than blade; tendrils absent or rudimentary; blade oblong, oblong-ovate, or sometimes oval, 2.5–12 × 1.5–7.5 cm, not glaucous, puberulent abaxially, base rounded to slightly cordate, margins entire, apex broadly rounded to obtuse or abruptly pointed. Umbels 1–3, proximalmost axillary to bracts, 5–12-flowered. Flowers: perianth greenish; tepals 3–3.5 mm; anthers shorter than filaments; ovules (1–)2 per locule. Berries globose, 8–10 mm diam., glaucous. 2n = 26.
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