This will be the definitive treatment of the woody plants of Sonora, a remarkably diverse and biologically important region, where desert, temperate, and tropical biota meet and terminate. The Sonoran and Chihuahan deserts verge on temperate, and mountain forests and tropical mangrove estuaries along the coast. Felger is the recognized expert in the area, and the book contains an enormous body of information nowhere else obtainable. It covers the approximately 270 species of native and naturalized trees, featuring identification keys and original line illustrations of the leaves of every species and the diagnostic flowering and fruiting bodies of most species. The descriptive species accounts contain common names and synonyms, ecological and geographic data, ranges, natural history, economic uses, and conservation status, as well as the standard taxonomic descriptions.