Also called Esthwaite waterweed and waterthyme.

Part of family Hydrocharitaceae.

Native to 🌍︎🌏︎ Europe, Asia, Africa, and Australia.   🗺 Map by county (🇺🇸 USA-48) (color key).   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-Planting List by Seneca Nation of Indians SNI.  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 NRCS PLANTS db USGS Wikipedia