Its easiest to tell when they fruit. Look at the flower, fruiting height, fruit size shape etc.. Link below to Id forum at Bananas.org

Here is a link that might be useful: Banana ID

OK Thank you. These have never fruited. I've had them for a few years. The first one came from my Dad. His have fruited before, so I hope these will eventually. They are pretty prolific. I started with 3 and now have about 16. I need to spread them out and create a grove.