Access point: San Pedro Valley County Park, Pacifica

Details: Due in part to its biologically isolated location near the end of a peninsula, the mountain has an extensive and unique biodiversity, especially on the serpentine soils of the lower slopes. A number of plant endangered species are found on this mountain, including Hickman’s potentilla and San Mateo thornmint, Acanthomintha duttonii The rare endemic manzanita Arctostaphylus montaraensis was named for this mountain.