WordNet (r) 3.0 (2006):

Calochortus macrocarpus
    n 1: mariposa having loose clusters of one to three handsome
         lilac flowers resembling umbels atop stout erect stems;
         arid northwestern North America east of Cascade Mountains
         from southern British Columbia to northern California [syn:
         sagebrush mariposa tulip, Calochortus macrocarpus]