Over one thousand full-color photographs feature leaves, flowers, fruit, and other identifying characteristics.

Covers 630 species, presents all the native and naturalized trees of the western United States and Canada as far east as the Great Plains, illustrates important visual details with range maps that provide a thumbnail view of distribution for each native species; gives scientific and common names, taxonomy, information on the most recently naturalized species, and also contains a key to leaves, an introduction to tree identification, forest ecology,...