Subshrubs or vines, 3–10 dm. Stems trailing or twining, dark green, apex flexuous. Leaves: petiole 6–22 mm; blade narrowly ovate to lanceolate, 2.5–4 × 1.5–2 cm, base shallowly cordate to truncate, margins serrate to crenate, apex acute to acuminate. Inflorescences terminal (often appearing leaf-opposed), glands stipitate, prominent throughout, staminate flowers 10–30 per raceme; staminate bracts 0.5–1.5 mm. Pedicels: staminate 1–2 mm, persistent base 0.3–0.7 mm; pistillate 3–7 mm in fruit. Staminate flowers: sepals 3, green, 0.7–1.2 mm; stamens 3, filaments 0.2–0.4 mm. Pistillate flowers: sepals lanceolate, 0.7–1.5 mm; styles connate 1/3 length; stigmas smooth to undulate. Capsules 4–5 mm wide. Seeds dark brown to black, 1.9–2.2 mm.
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