Hi
I'm just lurking on this forum and ran across your post.I can't answer your question,but I can tell you that I live in San Diego county and I have the same type of canna as you are showing in your pic. I too would like more info on what kind they are. Last year I transplanted my cannas from a very hot dry location because we were doing patio work. I moved them to a location that is more in the shade and they did leaf out really nice but did not flower.I'll be moving them again this fall when they go dormant.
I hope someone can jump in here and let us know what kind they are.
Thanks
Julie

I purchased some seem this year from TradeWindsFruit.com and have some Canna that sprouted successfully. They have the same huge leaves as what you show.

Here's a pic...

{{gwi:537584}}

I think these are close hybrids of Canna edulis.

Any hybrid Canna is generally slapped with the name Canna x generalis, no matter what parent stocks were used to derive it. Canna x generalis is termed "Common Garden Canna" and includes all sorts of hybrids.

The top plant is the species Canna compacta, also known for some reason as Canna 'Robert Kemp'.

Thanks so much William!!! Anyone have any idea what the bottom one is? :)