Herbs, spreading, annual, 0.5-3 dm, glabrous, greenish, sometimes grayish or reddish. Stems: caudex absent; aerial flowering stems erect, solid, not fistulose, 0.2-1 dm, glabrous except for few glands proximally. Leaves basal; petiole 0.5-3 cm; blade round to round-reniform, 0.5-2 × 0.5-2 cm, densely white-tomentose abaxially, floccose to glabrate and greenish adaxially, margins plane. Inflorescences cymose, open to diffuse, 5-25 × 5-25 cm; branches glabrous; bracts 3, scalelike, 1-2.5 × 1-2 mm. Peduncles capillary, spreading to slightly recurved, straight or curved, capillary, 0.5-3 cm, glabrous. Involucres turbinate-campanulate, 0.6-1.2 × 0.7-1.3 mm, glabrous; teeth 5, erect, 0.4-0.6 mm. Flowers 0.8-1 mm in early anthesis, becoming 1.2-2 mm; perianth yellow in early anthesis, becoming white to rose, short-hispidulous; tepals dimorphic, those of outer whorl cordate, becoming saccate-dilated proximally, those of inner whorl spatulate; stamens included, 0.5-0.9 mm; filaments mostly glabrous. Achenes brown to dark brown, usually lenticular, 0.8-1 mm, glabrous. 2n = 40.
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