Canna 'Colossal' is a medium-sized cultivar, with green leaves and red flowers.
Colossal White requires research.
Canna 'Columbia' is a medium-sized Crozy Group cultivar, with green leaves and red flowers.
Canna 'Commandant Dubois' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Commandant Faurax' is a medium-sized Crozy Group cultivar, with green leaves and red flowers.
Canna 'Commandant Rivière' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Compact de Villée' is a medium-sized Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'compacta' is a medium-sized species, with green leaves and red flowers.
Canna 'compacta f. Robert Kemp' is a small species, with green leaves and red flowers.
Canna 'compacta Roscoe x 'Rachael Kemp'' is a medium-sized Foliage Group cultivar, with green leaves and red flowers.
compacta-grandiflora requires research.
Canna 'Compte de Bouchaud' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Comte de Ganay requires research.
Comte Horace de Choiseul requires research.
Canna 'Comtesse d'Hauteville' is a medium-sized Crozy Group cultivar, with dark leaves and red flowers.
Canna 'Comtesse de Bouchaud' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
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.
Canna 'Confetti(2)' is a small Crozy Group cultivar, with green leaves and white flowers.
Canna 'Constitution' is a medium-sized Conservatory Group cultivar, with dark leaves and pink flowers.