Unlike a lot of "field guide" type books, this volume goes into thorough detail on the ecology and character of each tree in a way that is very engrossing, especially if you like ethnobotany (which I do). I felt as if I could just read this cover to cover -- it's not something that you'd use on the trail to identify or look up specific trees, but rather something you'd read later on at home after you've gathered your notes for deeper understanding. The illustrations are beautiful and very detailed, but as they are just illustrations and not photos, this is another reason why I wouldn't use it as a field guide for identification. Of course in an ideal world for learning to ID plants, these would be color photographs, but I can appreciate the particular magic these illustrations have from being both very anatomically detailed and artfully composed. You can tell that only someone with a deep appreciation for the spirit of each species would make illustrations like this (props Ramona).