Annual herbs. Leaves alternate or sometimes opposite, pinnatisect with filiform lobes, rarely simple, glandular. Capitula in a leafy panicle, heterogamous; phyllaries in 1 to few rows; receptacle epaleate. Corolla with female ray florets and hermaphrodite disc florets; anther appendage narrowly ovate. Achenes black, narrowly obpyramidal; pappus of hyaline scales.