In the next stage of the Peterson wildflower guide's organization, the plants are arranged by similar visual characteristics. There is a simple outline and description of this system at the beginning of the book. The book utilizes helpful icons, which are featured at the tops of all the descriptive pages for quick thumb-through reference. I have found this icon system very helpful in teaching plant identification because it provides a systematic approach that the beginner can pick up quickly and easily. The Peterson system greatly facilitates intial accuracy of identification at the level of plant family. Once you learn the system of what to look for when observing a plant, the icons allow speed and efficiency when using the book in the field.
At the final stage of identification, the species level, the Peterson guide has excellent written descriptions and the important subtle differences between species are well highlighted, with both text and arrows on the drawings. As other reviewers have stated, the Peterson book has more illustrations than Newcomb, and the highlighted habitat/range descriptions also help in quickly placing a plant. The black and white illustrations are not bothersome since you already know the flower color, and line drawings show key characteristics clearly. The use of illustrations instead of photos is always preferred in a field guide, even though photos seem like a good idea at first glance. A good illustrator shows the plant in the best light and makes sure the key features are visible and prominent.
