Book excerpt: Over 570 high-resolution, color photographs fill this easy-to-use field guide. Beginners to the world of aquatic plants will enjoy the easy descriptions and abundant photographs, while more advanced biologists will appreciate the comprehensive treatments, dichotomous keys, and other resources. It covers 164 species in total, including both native and non-native species, over 20 species of macro-algae (Chara, Nitella, etc.) and an appendix of non-native species in nearby states that are threatening to invade our region in the future.