[Wikipedia] Rarity, Habitat, Threats: This shrub is endemic to San Luis Obispo County, California, where it is known only from the vicinity of Morro Bay. It is limited to a specific type of substrate known as "Baywood fine sands", a type of sandy soil which originated in the Pleistocene as windblown sand dunes.[3] The plant is found on less than 900 acres of coastal sage scrub and chaparral habitat, sometimes forming monotypic stands on hillsides.[3] Two thirds of its habitat is privately owned, some of it is slated for development, and its habitat requirements are narrow; these and other problems led to the plant's being listed as a threatened species in 1994.[3] Some of the plants are protected within Montaña de Oro State Park (link added by Mary Ann Machi)