Annual or perennial. Leaves petiolate, pinnately dissected; segments fili¬form to lanceolate or oval; leaf bases sheathing. Involucre of many entire or divided bracts. Rays usually numerous. Involucel of many linear bractlets. Calyx teeth minute or obsolete. Petals white or yellowish-white. Stylopodium depressed to shortly conical; styles slender. Fruit oblong to ovate; ridges thin; furrows I-vittate; commissure 2-vittate. Inner seed face plane.