Sigesbeckia

Annual herbs. Leaves opposite, sessile to petiolate, simple, viscid-glandular. Capitula broad-campanulate, in loose terminal cymes, pedunculate; involucral bracts 2-seriate, unequal, herbaceous; outer involucral bracts c. 5, spreading or reflexed; inner involucral bracts c. 8, each enclosing a ray floret, erect; receptacle convex, with prominent scales each enclosing a disc floret. Ray florets 1-seriate, female, ligulate, small, usually yellow; style with short, linear, obtuse branches; disc florets bisexual, tubular, corolla funnel-shaped, 5-lobed, usually yellow; anthers obtuse at base, apex with a short obtuse appendage; style bilobed, branches short, acute. Cypselas ovoid-obloid, often incurved; pappus absent.