Also called common water-starwort.  Part of plantain  family Plantaginaceae.

Native to 🇪🇺 Europe.  Invasive > in USA+Canada Invasive > report it! Invasive > in USA Invasive > in Michigan

Learn more about ♒︎ pond water-starwort Callitriche stagnalis

Discover Life Encyclopedia of Life Google Google images USDA PLANTS db Wikipedia