Low annual herbs, glabrous, often glaucous with watery sap. Stem or scapes erect, ascending or prostrate. Leaves 2-4-pinnatisect or parted; ultimate lobes linear to narrowly obovate. Radical leaves more divided than cauline. Inflorescence a dichasial cyme. Flowers yellow, white, or purplish. Sepals 2, small, deciduous, free, ovate to lanceolate. Petals 4, in 2 series; outer two lobed or entire, obovate and obtuse; inner 2 trilobed with concave middle lobe. Stamens 4, free, opposite the petals, with sometime a stipitate gland on either side at the base of each winged or dilated filament; anthers dithecous. Ovary linear, unilocular, style short; stigmas 2, glandular at the tip, often recurved. Fruit linear, many seeded, lomentoid; seeds compressed, without aril.