Herbs, annual or short-lived perennial, with usually slender, occasionally slightly thickened, rootstock. Stems prostrate to reclining, 5–40 cm, glabrous. Leaves opposite; stipules distinct, subulate, 0.5–0.7 mm, glabrous; petiole 0.7–1.3 mm, glabrous; blade orbiculate, oval, to shortly oblong, 1–3.2 × 1.5–5 mm, base subsymmetric, rounded, margins entire, apex usually rounded, occasionally emarginate, surfaces glabrous; venation obscure, only midvein conspicuous. Cyathia solitary at distal nodes; peduncle 0.3–0.7 mm. Involucre turbinate to campanulate, 0.8–1.2 × 0.7–1 mm, glabrous; glands 4, red to purple, slightly concave, elliptic, 0.2–0.3 × 0.4–0.5 mm; appendages absent. Staminate flowers 15–36. Pistillate flowers: ovary glabrous; styles 0.2–0.3 mm, 2-fid nearly entire length. Capsules broadly ovoid, 1.3–1.8 × 1.5–2 mm, glabrous; columella 1.1–1.4 mm. Seeds whitish, reddish brown beneath coat, oblong, 4-angled in cross section, 1.5–2 × 1.3–1.8 mm, with 5–7 faint transverse ridges or wrinkles. 2n = 28.
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