Annual or perennial herbs, often rhizomatous. Lvs simple, entire to 1-3-pinnatisect, alternate. Capitula in corymbs, or rarely solitary, terminal, usually pedunculate; involucral bracts in 3-4 rows, often with membranous margins. Receptacle flat; scales 0 or few. Outer florets usually ♀ (sometimes all florets ☿), ligulate or ligule much reduced, yellow, white or pink; inner florets usually ☿ and tubular, transformed into ligulate florets in double forms. Achenes all similar, cylindric or clavate, sometimes with many small glands but otherwise glabrous, 3-10-ribbed; pappus a small toothed or lobed corona.