San Miguel Island
With an area of 14 square miles, San Miguel Island is the third-largest of the four Northern Channel Islands and is the sixth-largest island in the entire eight-island chain. It is the westernmost of the Channel Islands and is located 26 miles south of the Gaviota coastline. Santa Rosa Island, San Miguel’s closest island neighbor, is located 3 miles to the east.
The flora of San Miguel Island includes about 200 native taxa and 70 non-native taxa. The natural distribution of at least 18 of the island’s native taxa is restricted to two or more of the California islands.
One insular plant species (Castilleja mollis) is now known only from Santa Rosa Island but previously occurred on San Miguel Island as well.