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. In this case both agree that C. flaccida is a distinct species, and the DNA work by Prince and Kress at the Smithsonian Institution confirms its uniqueness.
Read more about this topic: Canna Flaccida