Herbs, annual, 0.5–5 dm, monoecious. Stems densely and dichotomously shortly branched, forming loose, prostrate circular mats 5–80 cm across, proximally bristly stellate-hairy, central radii spreading, 2–3 mm. Leaves mostly clustered near inflorescences; stipules rudimentary; petiole 0.3–5 cm, glands absent at apex; blade ovate to rhombic, 0.8–6.5 × 0.8–4 cm, base cuneate, margins entire, apex obtuse, abaxial surface pale grayish green, adaxial surface grayish green, both densely stellate-hairy. Inflorescences unisexual; staminate dense capitate clusters, 1–2 cm, flowers 2–10; pistillate clusters, 1–2 cm, flowers 1–3. Pedicels: staminate 0–1 mm, pistillate absent. Staminate flowers: sepals 5–6, 2–2.5 mm, abaxial surface densely stellate-hairy; petals 0; stamens 5–9. Pistillate flowers: sepals 0; petals 0; ovary 1-locular; style 1, 2–3 mm, unbranched. Capsules follicular (1-seeded), 3–6 × 2–3 mm, smooth; columella absent. Seeds 3–5 × 2–3 mm, shiny. 2n = 20.
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