Annual or perennial herbs, erect. Leaves commonly 3-pinnatisect. Capitula solitary or few, radiate (in Australia) or discoid; involucre multi-seriate, with bracts gradational in length; receptacle epaleate. Ray florets female, fertile. Disc florets bisexual; corolla 4-or 5-lobed. Achenes ± homomorphic, c. 4-angled, 3-ribbed, with prominent apical glands. Pappus present.