[Wikipedia] Rarity, Range, Description: Calochortus syntrophus is a rare species of flowering plant in the lily family known by the common names Callahan's mariposa lily and clustered mariposa lily. It is endemic to northern California, where it occurs in a remote area north of Montgomery Creek in Shasta County.[2] It has also been spotted in adjacent Tehama County.[2] Its habitat includes open, rocky areas with moist or wet soils in oak woodland territory. It was first discovered in 1993 and its description was published the following year.[3][4] The bell-shaped bloom has three whitish petals 3 to 5 centimeters long which are generally marked with a reddish-brown blotch near the base. The flower bases are yellow with whiskery glandular hairs. The petals turn from white to pink as they age.[2] (link added by Mary Ann Machi)