To the left is a photo of the first Potamogeton I was given. This grass looking plant is native to the United States. I think this plant looks more "grass like" than the other aquatic plants often referred to as grass like. Not like lawn grass, but like crab grass growing wild, with lots of blades coming off a main stock. Potamogeton spreads through runners somewhat like Val or Sag. It grows quite well and quickly. There are several similar species.