Coreopsis hamiltonii, the Mt. Hamilton coreopsis, is a rare California species of tickseeds in sunflower family. It is found only in a small region including Mount Hamilton and the Diablo Range in the southwestern San Francisco Bay Area (Alameda, Santa Clara, and Stanislaus Counties). Coreopsis hamiltonii typically grows 10-20 centimetres (3. 9-7. 9 in) tall or sometimes taller when in bloom. The foliage is low growing, producing bright golden yellow colored flower heads and red purplish tinted peduncles. The foliage is deeply cut with a thin ferny shape. It can be found blooming from March to May in California, where plants are found growing from 600-1,300 metres (2,000-4,300 ft) above sea level.