Annual or perennial herbs. Lvs alternate, simple, entire or serrate, often decurrent. Capitula pedunculate, solitary or in loose cymes. Involucral bracts in 2-3 rows, foliaceous or membranous. Receptacle convex, ovoid, or conic; scales 0. Outer florets usually ♀, sometimes sterile, ligulate, usually yellow. Inner florets ☿, tubular, sometimes all florets tubular and ligules 0. Achenes all similar, not compressed, 4-5-angled, narrowed to base, ribbed, often hairy on ribs and angles; pappus of 5-10, often aristate and laciniate scales.