Comtesse Gaston Chandon de Briailles requires research.
concinna Bouché is a synonym of indica var. indica.
Canna 'Conestoga' is a medium-sized Conservatory Group cultivar, with green leaves and yellow flowers.
Canna 'Confetti' is a small Crozy Group cultivar, with green leaves and multi-coloured flowers.
Confetti Pink requires research.
Canna 'Confetti(2)' is a small Crozy Group cultivar, with green leaves and white flowers.
confusa J.W.Richardson & L.B.Sm. is a synonym of paniculata.
Conowingo requires research.
Conquerant requires research.
Conqueror requires research.
Conseiller Bizet requires research.
Conseilleur Heidenreich requires research.
Constantin Fils requires research.
Constellation requires research.
Canna 'Constitution' is a medium-sized Conservatory Group cultivar, with dark leaves and pink flowers.
Canna 'Copicana' is a medium-sized Crozy Group cultivar, with green leaves and orange flowers.
Canna 'Copper Giant' is a tall Crozy Group cultivar, with green leaves and red flowers.
Canna 'Copper Lode' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Coq d'Or is a synonym of Oiseau d'Or.
Coq d’Or is a synonym of Oiseau d'Or.