Annual to perennial taprooted or rhizomatous herbs. Hairs bristly, spinous, or 0. Stems usually branching above. Lvs basal and cauline, pinnatifid to entire. Infl. a diffuse panicle, or spicate with capitula sessile in axillary clusters. Involucral bracts glabrous; outer bracts small; inner bracts becoming larger, not in distinct rows. Receptacle pitted, without scales or hairs. Corolla ligulate, yellow. Achenes pale or dark, 5-35, flattened, usually ribbed; beak paler than achene or concolorous; pappus bristles in 2 rows of equal length, white, > achene body, simple, free to base.

Perennial glabrous taprooted rosette herbs. Stems branching above. Lvs lyrate-pinnatifid, basal and cauline. Infl. a diffuse panicle. Involucral bracts glabrous; outer bracts few, small; inner bracts in 1 row. Receptacle pitted, without scales or hairs. Corolla ligulate, yellow. Style branches filiform, yellow. Achenes dark, usually 5, flattened, ribbed, beaked; pappus bristles in 2 rows, white, > achene, simple, free at base, the outer row < inner row.