Erect annual or perennial herbs. Leaves basal and cauline, alternate, 1–3-pinnatisect. Capitula radiate or discoid, solitary or in terminal corymbs, pedunculate; involucral bracts 2–5-seriate, unequal to subequal, herbaceous with scarious margins; receptacle convex to conical, naked. Ray florets female, 1-seriate, white. Disc florets bisexual, tubular; corolla 4- or 5-lobed, yellow; anthers obtuse at base with lanceolate-oblong apical appendage; style branches linear-oblong with truncate, penicillate apices. Cypselas 4-angled, 3-ribbed; pappus absent (sometimes a minute scarious rim present).
c. 30 species native to Eurasia, North Africa and North America; 1 species naturalized in Australia.