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Annual herbs. Lvs simple, entire to 1-3-pinnatisect, alternate. Capitula few in corymbs, or often solitary, terminal, pedunculate; involucral bracts in 2-4 rows, with membranous margins. Receptacle convex; scales 0. Outer florets ♀, ligulate, yellow, cream, or white, sometimes reddish toward base; inner florets ☿, tubular and 2-winged. Achenes dimorphic: those of ray florets 2-3-angled with angles often winged; those of disc florets terete in section or somewhat angled, ribbed, sometimes with inner and outer ribs slightly winged, sometimes with small glandular hairs; pappus 0.
