Herbs, erect, annual, (0.5-)1-4(-8) dm, glabrous, green to yellowish green. Stems: caudex absent; aerial flowering stems erect, occasionally hollow and fistulose, 0.3-1.3(-2) dm, glabrous. Leaves basal; petiole 2-3(-4) cm, pilose-hispid; blade round to reniform, 1-2(-3) × (0.5-)1-3 (3.5) cm, pilose-hispid and bright green on both surfaces, margins plane. Inflorescences narrowly cymose, open, 5-30(-50) × 5-35 cm; branches occasionally fistulose, glabrous; bracts 3, scalelike, 1-4 × 0.5-2 mm. Peduncles erect or nearly so, straight, slender, 0.2-0.3 cm, glabrous. Involucres campanulate, 2.5-3 × 2.5-3 mm, glabrous; teeth 5, erect, 0.5-1 mm. Flowers 1.5-2 mm; perianth pale yellow to yellow with light green or reddish midribs, becoming yellowish red, glabrous, papillate in fruit; tepals monomorphic, narrowly ovate; stamens included to exserted, 1-2 mm; filaments glabrous. Achenes light brown, 3-gonous, 2-2.5 mm, glabrous.
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