USGS page with help id hints and facts on related species:
USDA page from their PLANTS database - many helpful state distribution links:
http://plants.usda.gov/java/profile?symbol=SAMO5
Center for Aquatic and Invasive Plants at the University of Florida:
Aquaplant at Texas A&M University:
http://aquaplant.tamu.edu/database/floating_plants/giant_salvinia.htm
Mississippi Department of Marine Resources Web Release:
http://www.dmr.state.ms.us/Misc/Species-of-concern/salvinia.htm
Report a sighting of this invasive species - factsheet:
Bays and Bayous 2006 powerpoint presentation:
Publication in Gulf and Caribbean Research 2009 on research findings: