Annual to perennial, glab. to pubescent, erect to prostrate herbs; simple to much-branched, 3-60 cm. tall, with solitary to ∞ capitula corymbosely arranged. Lvs 1-6 cm. long, fleshy to membr., entire to toothed or variously lobed or pinnatifid; lobes broad-oblong to linear, obtuse to acute, toothed or not; petiolate to sessile, with or without amplexicaul bases. Capitula 5-20 mm. diam.; phyll. 10-15, linear, acute, us. distinctly 2-ribbed, reflexed in age, us. with a few small linear ones at base, forming a subamplexicaul involucre; ray-florets 10-15 or absent; ligules yellow, short to long, spreading to recurved, sts revolute; disk-florets ∞, about = involucre. Achenes linear, grooved, pubescent to glab., up to c. 3 mm. long; pappus-hairs us. cop., slender, finely to distinctly barbellate.
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