Phragmites are a tall, perennial, wetland grasses, occurring in both fresh and brackish waters. This 3-page fact sheet discusses the three genetic lineages, native, Gulf Coast, and Eurasian; and the threat posed to Florida ecosystems by an invasion of the exotic Eurasian type. Written by W. A. Overholt, R. Diaz, M. Hanson and D. Williams, and published by the UF Department of Entomology and Nematology, December 2011.
http://edis.ifas.ufl.edu/in898