Looking again at your OP I take back what I said. You do have Rotala sp. 'Bangladesh'. Sorry for the confusion.
This is the correct reference picture. Jeff got it directly from the guy who brought it back to the States.
Looking at a few others it does appear to be correct and have reddish stems. Huh, it never grew that color for me. I only have it emersed now so couldn't say for sure.
This one looks correct too.