In “The Orchid Thief,” author Susan Orlean wrote of a “phantom” flower hidden deep in the swamps of Southwest Florida “so bewitching that it could seduce people to pursue it year after year and mile after mile.” Her best-seller about an obsessive poacher would help make the once-obscure ghost orchid the most famous wild flower in the sprawling Everglades ecosystem. Twenty-five years later, the ghost orchid remains a star attraction during its summer bloom at the Audubon Corkscrew Swamp Sanctuary, one of the few places where everyday nature-goers can see one without slogging through muck and ch...