Potamogeton epihydrus is a species of aquatic plant known by the common name ribbonleaf pondweed. It is native to much of North America, where it grows in water bodies such as ponds, lakes, ditches, and slow-moving streams. This is a perennial herb producing a narrow, compressed stem branching to a maximum length which may exceed one meter. It has two types of leaf. Submersed leaves are up to 25 centimeters long but not more than one...