Annual herbs, ± prostrate. Leaves 1–3-pinnatisect. Capitula solitary, sessile, disciform; involucre 1-or 2-seriate, with bracts all of similar length; receptacle epaleate. Outer florets multi-seriate, female, lacking corolla; style persistent in fruit. Disc florets bisexual but functionally male; corolla 3-or 4-lobed. Achenes compressed, unribbed, glabrous or hairy. Pappus absent.