Taxonomy
In the last three decades of the 20th century, Canna species have been categorised by two different taxonomists, Paulus Johannes Maria Maas from the Netherlands and Nobuyuki Tanaka from Japan. Inevitably, there are differences in their categorisations.
Both agree that C. glauca is a distinct species, but in addition, Tanaka also recognises a separate variety.
Read more about this topic: Canna Glauca