The author is very experienced with the unique range of climates in Arizona and understands the harshness and extremes that plants must survive.
An Arizona-specific, cold-hardiness, zone map is used in this book. Very accurate if you garden in Arizona. Not useful outside AZ
Each plant entry has specific zoning and good photos; bloom/color season, mature size, care and growing tips. The entries are arranged and color-coded into general plant types (cacti, grasses, trees, shrubs).
This is a good book for selecting plants to grow successfully in an Arizona Garden. Check the biblography for more books that address Arizona's specific climate