Herbs, 1.5–5.5 dm. Stems erect, purple-green to reddish black, apex never flexuous. Leaves: petiole 1–5 mm; blade oblong to oblanceolate, 3–7 × 1–2.8 cm, base acute to obtuse, margins coarsely serrate, teeth apices often somewhat recurved, apex acute. Inflorescences terminal (appearing leaf opposed), glands absent, staminate flowers 2–5 per raceme; staminate bracts 1–2 mm. Pedicels: staminate 1.3–1.6 mm, persistent base 0.2–0.4 mm; pistillate 2–3 mm in fruit. Staminate flowers: sepals 3–4, green, 1.5–2.5 mm; stamens 4–5, filaments 0.7–1.3 mm, connate 1/2 length. Pistillate flowers: sepals rhombic-lanceolate, 1–4 mm; styles connate 1/4 length; stigmas undulate. Capsules 6–7 mm wide. Seeds dark brown, 2.5–3.2 mm.
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