This pretty little bunch of flowers is from the lemonade sumac, Rhus integrifolia. This plant gets its name from the sweet but tart fruits that it produces in the summer. Word is that you can make a lemonade tasting drink by boiling the berries, but I like liking the sap from the berries straight up. Just be sure you have the lemonade sumac and not some other kind. Other types of sumac are said to be toxic.
They are found in the coastal scrub areas and chaparral areas of southern California. They are able to grow in very nutrient poor soil as well as sand. Their thick small leaves and flowers helps make them resistant to droughts.