Annual herbs. Lvs mostly alternate, sometimes lowermost few opposite, simple, entire. Capitula usually in small clusters, rarely solitary. Involucral bracts 4-5 in 1 row. Receptacle obconic; scales present, in 2-3 rows and appearing as bracts, star-like, at fruiting. Outer florets ♀, filiform; inner florets mostly ☿, tubular. Achenes somewhat dimorphic, oblong to obovoid, gradually narrowed to apex; outer achenes slightly curved, enclosed in outer scales, lacking a pappus; inner achenes straight, free, with a pappus; pappus hairs in 1 row, narrow at apex.