Great pictures, everybody! I love Cannas, too. Wish I had more types.
I found it online called Canna glauca 'Erebus' but Plant Delights also has it called Canna 'Thai One On'.
Two sources:
PlantFiles: Detailed information on Aquatic Canna Lily Canna glauca 'Erebus'
PDN -- Canna 'Thai One On'
