Herbs, erect to spreading, annual, (0.5-)1-5(-7) dm, glabrous or sparsely hispid, grayish. Stems: caudex absent; aerial flowering stems erect, solid, not fistulose, 0.5-1.5(-3) dm, glabrous or sparsely hispid. Leaves basal; petiole 1-5 cm, glabrous or sparsely hirsute; blade obovate to round or reniform, 1-5 × 1-5 cm, sparsely villous to hirsute and green on both surfaces, becoming glabrous with age, margins plane. Inflorescences cymose, open to dense, 5-40(-50) × 5-50 cm; branches not fistulose, glabrous or sparsely hispid; bracts 3, scalelike, 0.5-2(-3) × 0.5-2.5 mm. Peduncles erect, straight, slender, 0.5-2.5(-4) cm, glabrous. Involucres campanulate, 0.6-1.5 × 0.8-1.5 mm, glabrous; teeth 5, erect, 0.2-0.4 mm. Flowers 1-2.5 mm; perianth white with greenish or reddish midribs, rarely yellowish, becoming pink to rose, glabrous; tepals monomorphic, oblong to narrowly ovate; stamens included to exserted, 1-1.8 mm; filaments glabrous. Achenes shiny light brown to brown, 3-gonous, 2-2.5 mm, glabrous.
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