Mt. Gleason Indain Paintbrush (Castilleja gleasonii) is endemic to the western San Gabriel Mountains of Los Angeles County, the perennial grows on granitic soils in conifer forest habitat above 5,000 feet. Fewer than ten occurrences are known, all located in the Angeles National Forest at Messenger Peak/Flat, Mount Gleason, Lightning Ridge, and east to Chilao, Horse Flats, and the Little Rock Creek area (Mistretta and Brown 1987a).*
*Courtesy of http://www.cnps-sgm.org