Slender Mariposa Lily (Calochortus) is a beautiful yellow mariposa lily is an uncommon, erect, slender- and straight-stemmed annual growing to about 12" tall, it is found in shaded foothill canyons and chaparral to approximately 3000' at the south base of the San Gabriel Mts. The leaves are linear and grass-like, 4"-8" long below and reduced above, and are often withered by the time of flowering, there are from 1-6 large and showy deep-yellow flowers rising from a common terminal point on the stem, markedly cup-shaped, with three lanceolate to ovate yellow sepals and three broadly cuneate to obovate yellow petals.