Annuals or perennials, (3-)10-30 cm. Stems prostrate to erect, branched from bases or ± throughout. Leaves cauline; opposite; petiolate or sessile; blades obovate or spatulate to linear, bases rounded to ± cuneate, margins entire [toothed or lobed], faces hairy. Heads radiate, borne singly. Involucres hemispheric to ± rotate, 4-12+ mm diam. Phyllaries persistent, 8-21 in 2-3 series (lanceolate to linear, outer distally herbaceous, others each with stiff, subulate appendage). Receptacles convex to conic, paleate (paleae conduplicate, scarious). Ray florets 5-20, pistillate, fertile; corollas white or yellow (laminae sessile, persistent, becoming papery). Disc florets 15-60, bisexual, fertile; corollas distally yellow to orange (sometimes drying white), tubes much shorter than funnelform throats, lobes 5, deltate. Cypselae ± terete or obscurely 3-4-angled to compressed or flattened (all usually tuberculate and usually bearing uncinate hairs; none, some, or all in each head winged); pappi persistent, of 3-4 awns. x = 8, 11.