Tree diversity in southern California's urban forest: the interacting roles of social and environmental variables

1 Department of Biology, University of Utah, Salt Lake City, UT, USA, 2 Department of Geography, University of California, Los Angeles, Los Angeles, CA, USA, 3 Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA, USA, 4 Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, USA, 5 Institute of Environment and Sustainability, University of California, Los Angeles, Los Angeles, CA, USA