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.
cearensis Huber. is a synonym of indica var. indica.
Canna 'Celine Lover' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Centenaire is a synonym of Centenaire de Rozain-Boucharlat.
Centenaire de Rozain Boucharlat is a synonym of Centenaire de Rozain-Boucharlat.
Canna 'Centenaire de Rozain-Boucharlat' is a medium-sized Premier Group cultivar, with green leaves and pink flowers.
Centenaire de Rozain-Bourcharlat is a synonym of Centenaire de Rozain-Boucharlat.
Centenárium requires research.
Centennial is a synonym of Merle Cole.
Canna 'Centurion' is a tall Crozy Group cultivar, with green leaves and orange flowers.
Canna 'Cerase' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Cerise Beauty' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Cerise Bell' is a medium-sized Foliage Group cultivar, with dark leaves and red flowers.