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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. The species have large, attractive foliage, and horticulturists have turned it into a large-flowered and bright garden plant. In addition, it is one of the world's richest starch sources, and is an agricultural plant.  Source