Canna 'Rosebud Cream Supreme' is a tall Australian Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Rosemawr' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Rosemond Coles' is a medium-sized Crozy Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Rosenkavalier' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Rosever' is a small Crozy Group cultivar, with dark leaves and pink flowers.
Rosy Stripes requires research.
Royalty requires research.
Canna 'Rubra Nerva' is a medium-sized Foliage Group cultivar, with dark leaves and red flowers.
Canna 'Rubra Perfecta' is a medium-sized Foliage Group cultivar, with dark leaves and red flowers.
Canna 'Rubra Superbissima' is a tall Foliage Group cultivar, with dark leaves and red flowers.
Canna 'Ruby Cole' is a small Crozy Group cultivar, with green leaves and pink flowers.
Ruby Crout requires research.
Canna 'Russian Red' is a tall Foliage Group cultivar, with dark leaves and red flowers.