Canna is a genus of 19 species of flowering
plants. The closest living relations to cannas are the other plant families of
the order Zingiberales that is
the Zingiberaceae, Musaceae, Marantaceae, Heliconiaceae, Strelitziaceae, etc. Canna is the only genus in the family Cannaceae. The APG II system of 2003 also recognizes the family,
and assigns it to the order Zingiberales in
the clade commelinids, in the monocots. Source
