Coreopsis

Annual or perennial herbs or shrubs. Leaves opposite or rarely alternate, sessile or petiolate, simple, lobed or compound. Capitula cup-shaped, in loose terminal corymbs or panicles or solitary, long-pedunculate; involucral bracts usually 2-seriate, outer ones herbaceous, inner ones larger and membranous; receptacle flat to slightly convex, with hyaline scales. Ray florets sterile or rarely female, 1-seriate, ligulate, yellow. Disc florets numerous, bisexual, mostly fertile, tubular; corolla funnel-shaped, (4–)5-lobed, yellow or brownish; anthers obtuse or minutely sagittate at base; style bilobed, branches linear, obtuse to cuspidate. Cypselas ovoid, compressed, usually 2-winged or with spongy or cartilaginous margins; pappus of 1 or 2 barbed or naked awns and/or bristles, a small cup, or sometimes absent.