Caribbean is a synonym of indica var. indica.
Canna 'Caribbean Sunset' is a medium-sized Crozy Group cultivar, with green leaves and orange flowers.
Carman is a synonym of Eureka.
Carmen is a synonym of Eureka.
Carmen Sylva requires research.
Carmine Beauty requires research.
Carmine King requires research.
Canna 'Carnaval (1)' is a tall Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Carnaval (2)' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
carnea Roscoe is a synonym of indica var. indica.
Canna 'Carolina Gold' is a medium-sized Premier Group cultivar, with dark leaves and yellow flowers.
Canna 'Carolina Moonglow' is a medium-sized Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'Carolina Pink' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Caroni is a synonym of glauca f. Caroni.
Canna 'Carousel' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Carrillon requires research.
Canna 'Castagniès' is a medium-sized Crozy Group cultivar, with dark leaves and red flowers.
Canna 'Casteldor' is a small Crozy Group cultivar, with green leaves and yellow flowers.
Cattleya is a synonym of Allemania.
Cavalaire requires research.