The dominant plant community on the island is coastal bluff scrubland, with giant coreopsis, Coreopsis gigantea and coyote brush, Baccharis pilularis the most visible components.
The woodland understory exhibits toyon, coffeeberry, poison oak and, in the higher exposed areas with ecotones to chaparral, containing chiefly coyote brush.
CalFlora database: Baccharis pilularis (coyote brush)
The shrubs include willows and coyote brush.
There is also a considerable abundance of poison oak and coyote brush present in these exposed rocky thin soil habitats.
Here the predominant species are Sargent Cypress, various Arctostaphylos species and coyote brush.
There are humid chaparrals made up of coyote brush, poison oak, elderberry, snowberry, bracken fern, and blackberry brambles.
In the oak woodlands, the dominant understory plants are native bunch grass, toyon, blackberry, western poison-oak and in drier patches coyote brush.
Common plants on the ridges include coyote brush, poison oak, California sagebrush, sticky monkey flower, and California blackberry.
In these oak woodlands, the dominant understory plants are toyon, blackberry, western poison-oak and in occasional drier patches some coyote brush.