I heard an interesting radio segment on WNYC about the introduced and endangered plant communities around New York City (such as this rare ground orchid). We've lost about 50 native plant species over the past couple of decades. Meanwhile, other new plants that once couldn't survive here now do. Listen below.
"Dr. Gerry Moore, director of science at the Brooklyn Botanic Garden and coordinator of the New York Metropolitan Flora project, discusses the first definitive findings that New York is losing native plants and many are being replaced with new plants, many from the South. The New York Metropolitan Flora Project is the most comprehensive study ever undertaken of plant biodiversity in the metropolitan New York area."