Sclerocarpus Jacq.
Family: Asteraceae
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Annuals [perennials or subshrubs], 60-200 cm. Stems sprawling to erect, branched from bases or ± throughout. Leaves mostly cauline; opposite (proximal) or alternate; petiolate [sessile]; blades 3-nerved, ovate to rhombic or lanceolate, bases cuneate to rounded, margins coarsely toothed, faces glabrous or ± scabrous. Heads radiate, borne singly. Involucres rotate to hemispheric, 12-20 mm diam. Phyllaries persistent, 5-8[-21] in 1(-2) series (green, oblong to linear). Receptacles low-conic, paleate (paleae each closely investing subtended floret, each forming a hard perigynium around a fruit and shed with it). Ray florets 5-8, neuter; corollas (readily falling) yellow to orange. Disc florets 10-50, bisexual, fertile; corollas usually yellow to orange, sometimes with purple, tubes much shorter than cylindric throats, lobes 5, lance-linear. Cypselae (within perigynia) weakly compressed, obliquely obovoid or arcuate (glabrous); pappi 0, or coroniform (of distinct or connate scales or bristles). x = 12.

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