APPW aims to cover all genera of freshwater aquatic and wetland plants currently cultivated in the aquarium and pond plant trade around the world. Aquatic plants covered in APPW include both common and uncommon to rarely cultivated genera and species. The number of aquatic plants worldwide is enormous, so APPW attempts to cover all those genera that are cultivated commercially in nurseries around the world as well as in private collections. Also included are some genera not currently cultivated for the trade but grown in association with ornamental ponds.

Organization:USDA APHIS PPQ

Image Source: http://idtools.org/id/appw/