But that link (I also saw that before posting last night) seems to indicate that it grows on land. I found this submerged in water, none were on the dry part of the creek, there was just a few of them but the rest were tiny, 2 leaves, 3 at most and all were in the water. Actually there were snail sacks (4mm to 6mm sized) on the plant and something seed-like, what I believe to be leech eggs, many of them. Not sure if indeed they were leeches but when I popped one to see what it is, 2 or 3 maroon-brown squirmy worm-like creatures (2mm) came out in a scurry. Plus the leaves from the link seem to have jagged edges.
I know I am probably more wrong than right but I'm not convinced doctor.
Here is close up of how the roots spread. Also on the right side of the photo is a small worm/larvae.. I don't know what it is but whatever it is I took it out and terminated it. The worm had a tough body, as I could feel it while crushing it with a toothpick.