Herbs, spreading, annual, 0.5-4 dm, glabrate, glabrous or sparsely glandular, greenish, grayish, or reddish. Stems: caudex absent; aerial flowering stems erect, solid, not fistulose, 0.3-1 dm, often sparsely tomentose and glandular proximally. Leaves basal; petiole 1-3 cm; blade oblong to narrowly ovate, 0.8-4.5 × 0.5-3 cm, densely white-tomentose abaxially, floccose or glabrous and greenish adaxially, margins often crenulate. Inflorescences cymose, mostly diffuse, 5-30 × 5-50 cm; branches sparsely glandular to glabrate or glabrous; bracts 3, scalelike, 1-2.5 × 1-2.5 mm. Peduncles erect, straight, capillary, 0.5-2.5 cm, glabrous and glandular-puberulent distally. Involucres broadly turbinate, 1.8-2 × 1.8-2 mm, minutely glandular-puberulent; teeth 5, erect, 0.4-0.6 mm. Flowers 1-1.7 mm; perianth white with greenish or reddish midribs, becoming red, glandular-puberulent with a tuft of long white hairs adaxially; tepals dimorphic, those of outer whorl broadly pandurate or flabellate, those of inner whorl oblanceolate; stamens included, 0.7-1.2 mm; filaments mostly glabrous. Achenes brown to black, usually lenticular, 0.6-0.8 mm, glabrous. 2n = 40.
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