Usually annual to perennial herbs, rarely shrubs. Lvs alternate, simple, entire, serrate or pinnatifid. Capitula few to numerous in panicles. Involucral bracts in 2-many rows, imbricate, the outer somewhat herbaceous, the inner mostly chartaceous. Receptacle ± flat; scales 0. Outer florets ♀, filiform or shortly ligulate, numerous, in 2-several rows; ligules white to purple. Inner florets ☿, tubular, fewer than ♀. Achenes all similar, obovoid to cylindric, compressed, hairy, with 0-2 narrow ribs; pappus of scabrid hairs in 1 row, sometimes with a short outer row.

Usually annual to perennial herbs, rarely shrubs. Lvs alternate, simple, entire, serrate or lobed. Capitula 1-numerous, solitary or in corymbs or panicles. Involucral bracts in 2-4 rows, imbricate, the outer somewhat herbaceous, the inner mostly chartaceous. Receptacle flat or convex; scales 0. Outer florets ♀, mostly distinctly ligulate, numerous in 1-2 rows, sometimes the inner ♀ florets filiform; ligules white to pink, blue or purple. Inner florets ☿, tubular, numerous. Achenes usually all similar, sometimes dimorphic, obovoid, compressed, hairy, sometimes with 1-4 narrow ribs; pappus usually of scabrid hairs in 1 row, sometimes with a short outer row of scales or hairs and then rarely the long hairs lacking on ray achenes.