Annuals, mostly 5-25 cm. Stems erect to spreading, branched from bases. Leaves mostly basal; subopposite or alternate; petiolate; blades ± deltate to elliptic, sometimes 3-lobed, ultimate margins ± serrate, faces sparsely hirsute or glabrate. Heads radiate, borne singly. Involucres turbinate to hemispheric, mostly 7-9 mm diam. Receptacles convex, knobby, epaleate. Phyllaries 8-22 in 2-3 series (lanceolate to linear, unequal, glandular-puberulent and sparsely strigose). Ray florets 5-13, pistillate, fertile; corollas golden yellow. Disc florets 30-90, bisexual, fertile; corollas yellow, sometimes suffused with purple, tubes (slender) longer than funnelform throats, lobes 5, spreading, deltate (style-branch apices truncate, penicillate). Cypselae obcompressed (each shed with subtending, linear, membranous scale, scales sometimes interpreted as paleae), margins ciliate; pappi fragile, of 17-22 bristles. x = 11.
