of hybridization with nearby Layia glandulosa, a genetic mutation, or simply induced by environmental conditions. References Harrison SP. 2013. Plant and Animal Endemism in California. University of California Press. External links Jepson Manual Treatment USDA Plants Profile Photo gallery discoidea Endemic flora of California ~ Natural history of the California chaparral and woodlands Natural history of San Benito County, California Natural history of Fresno County, California