Annual or perennial herbs with leafy stems. Leaves alternate, sessile or with a petioloid base, pinnately veined, serrulate. Capitula solitary, few, terminal on the inflorescence branches, erect, heterogamous, radiate; phyllaries multiseriate, imbricate; receptacle alveolate, alveoli with membranous teeth. Outer florets radiate, neuter; corolla of ray-florets with very short tube and broad 3-toothed ray; disc florets hermaphrodite; corolla shortly tubular below, abruptly dilated and deeply equally 5-lobed above; anthers strongly tailed, tails conspicuous, fringed; style branches short, obtuse, with a subapical dorsal fringe of hairs. Achenes of ray florets sterile, flask-shaped, of disc florets cylindrical, prominently obtusely 10-ribbed; pappus of numerous unequal fimbriate scales, somewhat fewer and shorter in the ray florets.