Originally Posted by Tinanti
You've already gotten the correct answer from four people. It's emersed grown glandulosa. Leaf shape can vary a bit, but the characters on which everyone's ID has been based are readily evident.
There's no need to be abrasive in your post. I can see the characteristics which are similar to the plant in question and given no other opinions as to what it could be, I suppose it may be l. grandulosa. However the plant in this picture:
is not precisely like the plant that I posted, and that fact too, is readily evident.