Ascending annual or short-lived perennial herbs or subshrubs; rootstock not tuberous. Leaves opposite or alternate, simple to pinnatisect or palmatisect, or pinnate. Inflorescences umbellate, (1–)2–7-flowered. Flowers regular; sepals not spurred; petals blue to pink, rarely white; fertile stamens 5, alternating with 5 shorter staminodes. Mericarps more or less hirsute with stiff antrorse hairs, falling free from the stylar column, awn tightly spirally twisted toward base, falcate and untwisted above, rigidly plumose along inner surface; seed remaining enclosed by body of mericarp.
Approximately 90 species, in warm-temperate regions around the world; 10 species (5 native, 5 naturalised) in Australia.