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DescriptionAnnual herbs. Leaves opposite, simple. Capitula less than 1 cm across, radiate, heterogamous. Phyllaries in 2 series, largely herbaceous, the outer much shorter, the inner with membranous margins. Ray florets female, fertile; rays few (usually 5), white, 3-lobed; disk florets bisexual, fertile, orange-yellow. Receptacle conic, with scales. Achenes narrowly obovoid. Pappus of scales, with or without terminal awns.