Annual or perennial herbs. Lvs alternate or all basal, simple, entire to 1-pinnatifid. Capitula pedunculate, solitary. Involucral bracts in 2-3 rows, foliaceous. Receptacle convex to subglobose, usually with numerous setae not subtending individual florets, sometimes glabrous. Outer florets usually sterile, sometimes ♀, ligulate, yellow, orange, or partly or wholly red or purple. Inner florets ☿, tubular, rarely all florets tubular and ligules 0. Achenes all similar, not compressed, 4-angled, narrowed to base, covered in long hairs; pappus of 5-10, often aristate scales.