Hi Tony. Its the one with the big round leaves in the bottom left corner. Here's a webpage about the banana plant:
http://www.aqualandpetsplus.com/Plant,%20Banana.htm
In less than a week, it has shot up a stem to the surface of the tank (not shown in these outdated pics). It is like a mini-water lily. Eventually, some stems will have white flowers at the water surface from pictures I've seen.