In the entire continental United States, only South Florida can lay claim to truly tropical habitats with native tropical plants. Rare ghost orchids grow in the humid depths of the Big Cypress, a region of vast prairies, haunting cypress strands, and deep sloughs filled with alligator flag. From its traditional start at Lake Okeechobee, the world's only Everglades sweep southward. North of Lake Okeechobee lie the remnants of ancient sand dunes forming...