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.
During the last three decades of the 20th century, the categorization of Canna species was determined by two separate botanists: Paulus Johannes Maria Maas from the Netherlands and Nobuyuki Tanaka from Japan.