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Hydrilla verticillata "The Perfect Aquatic Weed" University of Florida, IFAS, Center for Aquatic Plants http://aquat1.ifas.ufl.edu/hydcirc.html
HYDRILLA VERTICILLATA (L.F.) royle University of Florida, IFAS, Center for Aquatic Plants http://aquat1.ifas.ufl.edu/hydver2.pdf
General Information About Hydrilla Washington State, Department of Ecology http://www.ecy.wa.gov/programs/wq/plants/weeds/hydrilla.html
Hydrilla verticillata (L. f.) Royle waterthyme USDA Plants Database http://plants.usda.gov/java/profile?symbol=HYVE3
Hydrilla verticillata The Western Aquatic Plant Management Society http://www.wapms.org/plants/hydrilla.html