The is a variety called Canna Musifolia Grande that has leaves that look like that, and they can get as tall as 13'. Scroll down the page at the website link to see the description and a picture.

Here is a link that might be useful: Giant canna site

Canna Musa Grande's flowers are typical of wild Cannas ... small and narrow, kind of honeysuckle like.

This big Canna has large petalled flowers. Go to the Karchesky Canna site and compare "Green Wyoming" to "Musa Grande" and you'll see what I mean. I figure it's "Green Wyoming". That's not to say that "Wyoming" is not a hybrid that has "Musa Grande" as one of its lineage.

Stuttgardt with it's variegated leaves is a very interesting Canna. I wonder if I can get seed for that variety?

I have Wyoming Green and my cannas are blooming right now...look like your photo. The leaves should have a dark thin margin around the leaf. My Wyoming dark foliage is blooming now, too, even though we have been in th 30's for last several day and had snow yesterday for a short time.

Peggy