Annual herbaceous plants. The stem is straight, branched, up to 80 cm tall. The leaves are opposite, whole, 3-5-separate or dissected. The baskets are single or collected in common inflorescences; the wrapper is hemispherical or bell-shaped, the outer leaves are herbaceous, the inner ones are almost filmy, the flower is younger than the film, the marginal flowers are asexual, ligulate, yellow, sometimes there are none; the inner flowers are tubular; the achenes are flattened or triangular, with 2-4 bristles.