The name of this wed is
Delta arrowhead
Sagittaria platyphylla
Delta Arrowhead is a highly invasive aquatic weed in Africa, Australia, Asia, and Western North America. In waterbodies, it outcompetes desired vegetation, hinders recreation, and reduces wildlife habitat. Delta arrowhead grows along the shallow margins of lakes, ponds, streams, rivers, and man made drainage and irrigation channels and ditches.
Source : WASHINGTON STATE
Noxious Weed Control Board
