Manzanita

It is really hard to tell from this photo but this might be a species of Manzanita. They grow from two inches (some of the coastal species) to twenty feet tall (many interior species). There are hundreds of different species and cultivars from small shrubs to tree sized and native all over the state of California. Manzanitas are popular for their shiny red or mahogany colored bark. Manzanitas have urn-shaped flowers that vary from pink to white and are popular with hummingbirds. They are very drought tolerant and evergreen, always looking green and healthy even in the hottest, driest part of the summer. Manzanita (Arctostaphylos spp) is of the family Ericaceae. Plants in this family are highly mycorrhizal (associated with symbiotic fungi). This allows them to survive in many harsh environments; however, it also makes them very susceptible to over watering and fertilizing. Here is a link that you might find helpful:
http://www.laspilitas.com/groups/manzanita_arctostaphylos/southern/southern_california_Manzanitas.html