Herbs, erect, annual, (0.1-)1.5-8(-10) dm, glabrous, green. Stems: caudex absent; aerial flowering stems erect, occasion-ally hollow and fistulose, 0.1-3 dm, glabrous. Leaves basal; petiole 2-5 cm, pilose; blade round, 1-3 × 1-3 cm, pilose and bright green on both surfaces, margins plane. Inflorescences narrowly cymose, open, 10-80 × 5-50 cm; branches infrequently fistulose, glabrous; bracts 3, scalelike, 0.5-2 × 0.3-0.8 mm. Peduncles absent or only at proximal node, erect, straight, slender, 0.1-0.5 cm, glabrous. Involucres campanulate, 2-3 × (1.5-)2-3 mm, sparsely villous; teeth 6-8, erect, 0.5-0.8 mm. Flowers 1.5-2 mm; perianth white or greenish with pink to red midribs, becoming pinkish, glabrous, papillate in fruit; tepals monomorphic, lanceolate; stamens included to exserted, 1-2 mm; filaments glabrous. Achenes dark brown to black, 3-gonous, 1.3-1.5 mm, glabrous.
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