Annual, 15-30 cm tall, pubescent. Leaves bipinnate; segments ovate. Involu¬cre of 5 linear pubescent bracts, c. cm long. Rays 10-16, pubescent. Involucel of 5-8 linear bractlets, 5-6 mm long. Calyx teeth minute. Fruit c. 2 mm long, hispid; ridges prominent.