Machaeranthera pinnatifida (Hook.) Shinners Machaeranthera pinnatifida (Hook.) Shinners in Sida 1(5): 295. 1964 sec. Barkley & al. 2006=Machaeranthera pinnatifida (Hook.) Shinners var. pinnatifida in Sida 1(5): 295. 1964 syn. sec. ???