It does not look like tropicanna but I am unsure of which one it could be. Try the Canna forum someone there may know which one you have.

Looks to me to be canna australia.

Doesn't look dark enough to be Australia, what about Indica 'Purpurea'?

I looked up the images, I also feel it is not dark enough to be australia, but it does look a lot like the indica purpurea..

The flower doesn't seem right for indica purpurea, also the stalk seems too narrow and the leaves appear to have a satiny sheen.