National Audubon Society Field Guide to North American Wildflowers: Eastern Region The bestselling National Audubon Society field guides to North American wildflowers have been brought to a new level of beauty, accuracy, and usefulness. More than 700 new full-color photos, showing every species both in close-up and in its natural setting, highlight these updated guides. New introductions provide clearer and more complete explanations of how to identify each species.