Native Orchids of the United States and Canada by Hal Horwitz (Paperback)

"This book, a companion to the North American Orchid Conservation Center's Go Orchids website, is the first comprehensive field guide to the native orchids of the United States and Canada in decades; it integrates recent orchid taxonomic and nomenclature changes, updates to species' distribution ranges, known pollinators, ecology, and conservation statuses"-- Provided by publisher.