The first plant I had at the begining of this thread has surprised me with the changing of their leaves. In medium light they stay like the picture shows, in high light they turn into small spadelike shapes. I've got to buy some batteries for my camera but will post pics tommorrow. It leads me to think the Sago pondweed is really Potamogeton diversifolius especially since they look very alike until they change leaves...Jimjim
The first plant looks to me like Zannichellia palustris, Horned pondweed. I once got this plant out of Lake Mendota in Madison, Wisconsin, but I never tried it in a planted aquarium to see how suitable a community plant it would be. Unlike Potamogeton, it has underwater fertilization.