Herbs, annual, 0.1–0.4(–0.6) m, not glaucous, with taproot. Stems single, erect, unbranched or distally branched, often zigzag, solid, proximally usually glabrous or sparsely stellate-puberulent. Leaves cauline; stipules deciduous or inconspicuous, sometimes purplish, subulate, 1–1.5(–3) × 0.5–1 mm; petiole 0.5–1.5(–3) cm, usually 1/2 times involucellar bractlets absent. Flowers bisexual or unisexual and pistillate, plants gynodioecious; calyx 8–10(–12) mm, not much enlarging in fruit, stellate-canescent, sparsely ciliate; petals pink to rose-purple or white, pale-veined, often whitened at base, 18–20(–25) mm; stamens: outer filaments incompletely connate, distally distinct, anthers not attached to connate portion of filaments; staminal column 6–7 mm, hairy; anthers white, stalked, aborted in pistillate flowers; stigmas 6 or 7. Schizocarps 5–7 mm diam.; mericarps 6 or 7, 2.5–4 mm, sides smooth, margins rugose, back reticulate-veined, deeply pitted especially on top, glabrous or glandular-puberulent, mucro 0.5–0.8(–1) mm. Seeds 1.5–2 mm.
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