American Pondweed-click for more info

Non-Native American pondweed is a perennial plant that has both floating and a few submerged leaves in an alternate pattern. The floating leaves are elliptical to oval 4 to 7 inches long and to 2 1 inches wide on long petioles. Submerged leaves are not abundant and are blade-like, somewhat transparent and smaller than floating leaves. Fruits are on spikes that often stand above the water’s surface and are brownish to reddish 3 to 2 1 inches long and 1/8 to1/4 inches wide. Texas A&M