The leaves are elongated like many of the taller cannas out there. They are shaped almost exactly like my canna musafolia which gets very tall. Here is a link that may be helpful.
http://www.karcheskycanna.com/
There is a picture on this site of a canna that looks very much like yours. It is called c. indica 'Costa Rica'. You will get a better idea of what it is once the plants are established and reach full hieght.

thank you for your answer Southlatropical, and thanks for the link, I had looked through all their canna pictures already, but I will check one more time the suggested Costa Rica.

Evelyn