Herbs, spreading to somewhat erect, annual, 1-4.5(-6) dm, glabrous and often glaucous, yellow-green. Stems: caudex absent; aerial flowering stems erect, occasionally hollow and fistulose, 0.5-2(-3) dm, glabrous, minutely hirsute or short-hispid proximally. Leaves basal; petiole 1-6 cm, hirsute; blade broadly oblong, (0.5-)1-2.5(-4) × (0.5-)1-2(-3) cm, short-hirsute on both surfaces and greenish, margins wavy. Inflorescences cymose, open to dense, usually spreading, 5-30 × 5-50 cm; branches usually not fistulose, glabrous; bracts 3, scalelike, 1-4 × 1-2 mm. Peduncles mostly erect, straight, capillary, 0.5-1.5 cm, glabrous. Involucres turbinate, 0.7-1 × 0.6-0.9 mm, glabrous; teeth 4(-5), erect, 0.3-0.4 mm. Flowers 1-2 mm; perianth yellow to greenish yellow with greenish to reddish midribs, densely hirsute with coarse curved hairs; tepals monomorphic, narrowly ovate; stamens exserted, 0.9-1.5 mm; filaments sparsely pubescent proximally. Achenes light brown to brown, lenticular to 3-gonous, 1-1.5 mm, glabrous.
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