Also called Esthwaite waterweed and waterthyme.

Part of family Hydrocharitaceae.

Native to 🇪🇺 Europe, Asia, Africa and 🇦🇺 Australia.   🌎︎ Map by county (🇺🇸 USA-48) (colors).   Invasive > learn+quiz Invasive > 🌐︎ global Invasive > 🌐︎ various Invasive > 🇨🇦 Canada, 🇺🇸 USA Invasive > report it! Invasive > 🇺🇸 USA Invasive > Michigan prohibited in Michigan, incl. seeds, fragments and derivatives  Adobe Acrobat Reader file

🚼︎ For kids!  This plant described in invasive species placemat  Adobe Acrobat Reader file series.

Uses by native peoples
(Ethnobotany database)
  On No-Plant List by Seneca Nation of Indians.  Adobe Acrobat Reader file (page 62)

Learn more about hydrilla Hydrilla verticillata

Biological Control in Eastern USA  Adobe Acrobat Reader file (page 99)

🔍︎ 🔍︎ images Discover Life Encyclopedia of Life Flora of North America USDA PLANTS db USGS Wikipedia