here’s a great place I frequent – http://www.theodorepayne.org/
these also have some good references:
http://www.bewaterwise.com/knowledge01.html
http://www.cnps.org/cnps/publications/
these books are great resources:
designing california native gardens – glenn keator and alrie middlebrook
california native plants for the garden – carol borenstein/david fross/bart o’brien