Annuals, 10-100 cm. Stems 1-3(-15), usually branched distally, not winged, glabrous or sparsely hairy. Leaves glabrous or sparsely hairy; basal blades linear to ovate, entire or pinnately toothed or lobed to pinnatifid; mid and distal blades linear, entire. Heads (1-)10-150(-250+) per plant, in paniculiform arrays. Peduncles 3-11 cm, sparsely hairy. Involucres hemispheric to globose or globoid, 5-9 × 6-10 mm. Phyllaries moderately to densely hairy. Ray florets 8-10, pistillate, fertile; corollas yellow, 4.5-14 × 2-10 mm. Disc florets 75-250+; corollas yellow proximally, yellow to yellow-brown or purple distally, 1.6-2.7 × 0.8-1.2 mm, lobes 5. Cypselae 0.7-1.3 mm, moderately to densely hairy; pappi of 6-8 entire, aristate scales 1-1.8 mm.