Sagittaria platyphylla Directory References Discover Why Does the United States Have More Tornadoes than Any Other Country? Vietnam War Timeline 9 of the World’s Deadliest Spiders 26 Decade-Defining Events in U.S. History Why Do Some Cicadas Appear Only Every 17 Years? Timeline of the 1980s How Did Helen Keller Fly a Plane? Contents Sagittaria platyphylla plant Learn about this topic in these articles:arrowhead plants In arrowheadsagittifolia and S. platyphylla, and have naturalized in many streams, ponds, and agricultural waterways. Read More