Scientific Name: Pentachaeta bellidiflora
The White-rayed Pentachaeta (also known as the White-rayed Pygmy Daisy) is an annual herb in the aster family, native to California, and endemic (limited) to California alone. Very low population - currently existing at a single site, bisected by an interstate highway, in San Mateo County.
Habitat: Bunchgrass communities associated with serpentine soils.
Threats: Urbanization / construction, off-road vehicles, competition from non-native plant species when soils are disturbed, and possibly also vandalism.