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DescriptionAnnual herbs or suffrutices with annual stems, often woolly-hairy and thistle-like. Leaves alternate, sessile and clasping the stem. Capitula homogamous and discoid, all florets bisexual or heterogamous, the outer florets neuter. Phyllaries many-seriate, imbricate, usually spine-tipped. Receptacular scales 0. Ray florets usually 0. Disk floret corollas yellowish to creamy-brown or purplish to whitish. Achenes ± flattened-turbinate, densely hispid. Pappus of 2-several series of setae.