Biotic Communities catalogs and defines by biome, or biotic community, the region centered on Arizona, New Mexico, Sonora, Chihuahua, and Baja California Norte, plus California, Nevada, Utah, Colorado, Texas, Coahuila, Sinaloa, and Baja California Sur. Originally published in 1982 by the Boyce Thompson Southwestern Arboretum, this ambitious book is still a "must-have" for those working in natural resources management and ecological research, as well as non-specialists who wish to know more about a particular locale.

Biotic Communities is arranged by climatic formation with a short chapter for each biome describing climate, physiognomy, distribution, dominant and common plant species, and characteristic vertebrates. Subsequent chapters contain careful descriptions of zonal subdivisions. The text is supplemented with over one hundred black and white photographs illustrating almost every community type.