Subspecies chilensis (J. Rémy) Ertter is restricted to the Andes of Chile and Argentina. It, like another annual, Chorizanthe commissuralis J. Rémy, which is closely allied to our western C. brevicornu, is probably a recent introduction into South America (J. L. Reveal 1978; B. Ertter 1980; O. Shields and Reveal 1988).