This revised and expanded third edition features 95 full-color plates, 424 photographs and drawings and 252 maps. This comprehensive volume covers four desert floristic associations found in the Southwestern United States : Mojavean Desert, Colorado Desert, Arizona Desert, and Chihuahuan Desert. For anyone exploring these regions, this book will serve as an authoritative guide to the identification of nearly 500 trees and shrubs including woody vines, borderline bushes, and plants found mostly outside the desert but known to occur within its edges.