Annual, biennial, or perennial herbs or sometimes subshrubs, sometimes creeping but not rhizomatous. Lvs usually 1-3-pinnatisect or pinnate and then pinnatisect, rarely not divided, alternate. Capitula usually solitary, terminal, pedunculate; involucral bracts usually in 3 rows, usually at least the inner with membranous margins. Receptacle convex or conic; scales usually present, at least on upper part of receptacle. Outer florets usually ♀, rarely sterile, usually ligulate, rarely tubular, usually white or yellow, rarely purplish; inner florets ☿, tubular. Achenes all similar, usually obconic, terete or square in section, sometimes compressed, smooth, ribbed or tuberculate, eglandular; pappus 0, or a small corona or auricle.