[Wikipedia] Limited Range, Habitat, Taxonomy: Eryngium pendletonense (sometimes spelled E. pendletonensis) is a rare species of flowering plant in the carrot family known by the common name Pendleton button-celery. It is endemic to northern San Diego County, California, where it is known from four occurrences along the coastline between Oceanside and the Orange County border, including land within Camp Pendleton.[2] It grows on vernally moist coastal grassland and coastal sage scrub habitat with clay soils. It was first described as a species in 1999.[3] (link added by Mary Ann Machi)