A poem as lovely as a tree.
Sunset, the magazine of the west and publisher of many books about home and garden, has the favorite standby The New Sunset Western Garden Book. This excellent illustrated guide is easy-to-use, discusses the pluses and minuses of the many trees that you might consider for your yard, and very importantly talks about water needs. Use this book for all your garden needs and take it to the nursery when selecting new trees.
Flowering Shrubs and Small Trees by Isabel Zucker and Trees and Shrubs of Southern California by John Stuart will both help you identify local trees and select appropriate trees for your garden. The Stuart book has line drawings and a geographical map that shows where the trees grow best.
In addition, trees need to be trimmed. The American Horticultural Society Pruning and Training Handbook is a terrific go-to book that gives step-by-step advice and illustrations on how to prune trees. The before and after pictures are particularly helpful. Maybe just pruning is not on your mind, but topiary—the art of sculpting plants into shapes. Both The Art of Shaping Shrubs, Trees and Other Plants by Tatsuo Isimoto and Topiary and Ornamental Hedges by Miles Hadfield will get you started towards turning your garden into a work of art.
For those curious enough to read the entire text of Trees by Joyce Kilmer, go to the Poetry Foundation website: http://www.poetryfoundation.org/poetrymagazine/poem/1947and enjoy the full poem.