Annual, erect or prostrate, small, glabrous herb; stem diffusely branched from the base; branches grooved, strict or fluxuous; leaves alternate, 2-pinnatisect on long, slender petioles, lamina ovate, segments filiform; heads small, yellow, terminal or axillary, shortly peduncled, heterogamous; receptacle small, flat; involucre oblong; bracts 2-seriate; outer small, usually 1-3, slender with ciliate margins; inner much larger, oblong, obtuse, striated, glabrous with broad, membranous margins; stamens-5, epipetalous, syngenecious, anthers base entire; ovary-1 celled, 1-ovuled, solitary, basal, obtuse, style arms of females linear, acute, hispid tips; achenes narrowly oblong, dorsally much compressed, faces bearded; pappus of 2, small, smooth, stiff awns.