Presenting the fascinating natural world above treeline on the Northeast's highest peaks Above the treeline in the northeastern United States lies a beautiful and challenging environment, famous for its panoramic views, extreme weather, and alpine species. This revised and updated field guide book celebrates the flowers, mosses, lichens, insects, birds, and mammals that survive and thrive in difficult climate and terrain in New York, Vermont, New Hampshire and Maine. Featuring 350 stunning photographs and detailed accounts of 200 mountain species, including globally rare and true arctic species, this is the first field guide to unite all major northeastern alpine areas in a single, comprehensive volume. Naturalists, hikers, climbers, and other visitors to the high peaks in the Adirondacks, Green Mountains, White Mountains, and Katahdin will journey through northern hardwood, spruce-fir and krummholz forests before emerging into the fascinating world on the alpine summits in Maine, New Hampshire, Vermont and New York. Concise and informative, this guide includes updated scientific and common names, flowering times, habitat and range notes, and an easy-to-use flowering chart for quick reference on the trail. Chapters explore geology, weather, and plant communities, while also addressing urgent conservation concerns, from climate change and invasive species to the impacts of summit development. Compact enough to carry and beautiful enough to enjoy at home, this essential companion fosters a deeper commitment to protecting the Northeast's extraordinary high places.