Calochortus simulans
 Calochortus simulans is a species of flowering plant in the lily family known by the common name San Luis Obispo mariposa lily not to be confused with the San Luis mariposa lily C. obispoensis. It is native to San Luis Obispo County California and its range extends south into Santa Barbara County. It is a perennial herb producing a branching stem up to 60 centimeters tall. The basal leaf is 10 to 20 centimeters long and withers by flowering.