NatureServe
NatureServe represents an international network of biological inventories-known as natural heritage programs or conservation data centers-operating in all 50 U.S. states, Canada, Latin America, and the Caribbean. The network not only collects and manages detailed local information on plants, animals, and ecosystems, but develops information products, data management tools, and conservation services to help meet local, national, and global conservation needs.
The link address is: http://www.natureserve.org/getData/index.jsp