Herbs or vines, 2–12 dm. Stems decumbent, twining, or erect, light green, apex usually flexuous. Leaves: petiole 6–38 mm; blade triangular to cordate, 1.9–6 × 1.5–3.5 cm, base truncate to cordate, margins serrate to crenate, apex acute. Inflorescences terminal (often appearing leaf-opposed), glands absent, staminate flowers 2–8[–10] per raceme; staminate bracts 1–1.8 mm. Pedicels: staminate 0.7–2 mm, persistent base 0.4–1.5 mm; pistillate 2–4 mm in fruit. Staminate flowers: sepals 3–4[–5], green, 1–1.5 mm; stamens 3–4(–5), filaments 0.3–0.6 mm. Pistillate flowers: sepals ovate, 1.3–3.5 mm; styles connate 1/3 length; stigmas subpapillate to undulate. Capsules 6.5–7 mm wide, often 1 carpel maturing. Seeds dark brown, 2.5–3.8 mm. 2n = 44.
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