I have a related question. I have a similar looking plant in my tank. I got it through a trade, identified by the owner as Hygrophila lacustris. Someone told me later that the plant is actually Hygrophila salicifolia. Now I see that a similar (or maybe the same) plant is Hygrophila augustifolia. I am totally confused. Does anyone have pictures of these three species and/or would be able to elaborate on the differences between them?