[Wikipedia] Limited Range, Disjunct Populations: Phacelia insularis, the coast phacelia[1] is a rare species of phacelia. It is endemic to California, where it has a disjunct distribution. Phacelia insularis var. continentis - North Coast phacelia, is known only from the coastline of Mendocino and Marin Counties Phacelia insularis var. insularis - North Channel Islands phacelia, is native to Santa Rosa and San Miguel Islands, two of the Channel Islands of California. The latter variety is federally listed as an endangered species and may be currently limited to one occurrence on Santa Rosa Island.[2] (link added by Mary Ann Machi)