Annuals, 5-25 cm tall; stems erect to spreading, branched from the base; leaves mostly basal, sub-opposite or alternate, petiolate, blades deltate, to elliptic, margins serrate, hirsute or glabrate; heads radiate, borne singly; involucres turbinate to hemispheric, mostly 7-9 mm diameter; phyllaries 8-22, 2-3 series, lanceolate to linear, unequal, glandular-puberulent; ray florets 5-13, pistillate, corollas golden-yellow; disk florets 30-90, bisexual, corollas yellow, sometimes suffused with purple, lobes 5; cypselae linear, membranous scales, margins ciliate; pappi 17-22, bristles. Flowers summer through fall following rains.