Rutidosis

Perennial herbs; stems hairy or glabrous. Leaves cauline, sessile, alternate or some opposite toward base. Capitula sessile or pedunculate, hemispherical to subglobose, terminal, in corymbs or clusters; involucral bracts in several series, unequal, brownish, persistent; outer bracts scarious, sessile; inner bracts longest, similar but with an herbaceous midrib or glandular-pubescent claw; receptacle convex to conical, naked, pitted. Florets all bisexual or rarely a few female, yellow or white; corolla deeply 5-lobed and longer than involucre, or deeply 4-lobed and shorter than involucre; anthers tailed at base; style bilobed, with somewhat flattened branches, truncate to subcapitate and papillose at apex. Cypselas narrow-obovoid, attached obliquely, often oblique at apex, papillose; pappus a circle of several obovate to spathulate whitish scales, margins entire, ciliate, fimbriate or plumose.