Annual herbs, with medifixed or stellate appressed hairs. Leaves simple to pinnately lobed. Inflorescence a raceme, often more or less corymbose. Sepals erect, inner pair usually saccate; petals long-clawed, yellow (in Australia); stamens 6. Fruit pedicellate (sometimes shortly so), linear, quadrangular, elongate (more than 3 times as long as broad), dehiscent; style capitate, slightly bilobed; valves with conspicuous midvein; seeds in 1 row per locule.
100 species, mostly in Europe and the Mediterranean region; 1 species naturalised in Australia and Victoria.