Annuals, biennials, or perennials [subshrubs], 5-100+ cm; taprooted. Stems 1, erect, branched from bases and/or distally, glabrous or hairy. Leaves basal and cauline; basal sessile or petiolate, distal sessile; blades ovate-lanceolate to lanceolate or linear, margins entire or pinnately lobed to pinnatisect (faces glabrous or ± arachnose [tomentose]). Heads borne singly or in loose, corymbiform arrays. Peduncles not inflated, sometimes bracteate. Calyculi 0. Involucres ovoid to cylindric, 6-12[-16+] mm diam. (larger in fruit). Phyllaries 18-30+ in 3-5+ series, deltate or ovate to lanceolate or lance-linear (± flat proximally, not enfolding subtended florets), unequal, margins scarious, apices obtuse to acute. Receptacles flat, pitted, glabrous, epaleate. Florets 30-100+; corollas whitish to yellow or purplish. Cypselae whitish to brownish, narrowly columnar to obclavate or fusiform (sometimes ± stipitate), not beaked, nerves usually 10, sometimes 0, faces mostly glabrous, sometimes distally villosulous [lanate]; pappi persistent, of 28-50+, whitish, subequal, plumose to barbellate, subulate to setiform scales in 2-3 series. x = 7.
