Annual or perennial herbs. Leaves opposite at base, or alternate throughout, entire or pinnatisect. Capitula radiate, sometimes discoid, borne singly or in paniculiform cymes; calyculus of 1–8 deltate to linear bractlets, rarely absent; involucral bracts in 1 series, connate for most of length, usually bearing oil-glands; receptacle flat to convex, smooth or ± pitted, epaleate. Ray florets female, fertile, usually yellow to orange, rarely white. Disc florets bisexual, fertile, yellow to orange; tube shorter than ± cylindric throat; lobes 5, deltate. Achenes obpyramidal, narrowly obconic, or cylindrical, black. Pappus persistent, of 10 (–20) distinct scales, each scale dissected in several bristles.
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