Canna 'Roi Humbert 1er' is a medium-sized Italian Group cultivar, with dark leaves and red flowers.
Canna 'Roi Soleil' is a medium-sized Crozy Group cultivar, with green leaves and red flowers.
Canna 'Roitelet' is a small Crozy Group cultivar, with green leaves and red flowers.
Canna 'Roma' is a tall Italian Group cultivar, with green leaves and multi-coloured flowers.
Canna 'Romagna' is a medium-sized Italian Group cultivar, with green leaves and red flowers.
Romance requires research.
Romania requires research.
Canna 'Rosa' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Rosa Superba requires research.
Canna 'Rosalind' is a small Premier Group cultivar, with green leaves and multi-coloured flowers.
Rosamond Coles requires research.
Rosamund requires research.
Rosamunde requires research.
Canna 'Rose Beauty' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Rose Bud requires research.
Canna 'Rose Futurity' is a small Crozy Group cultivar, with dark leaves and pink flowers.
Canna 'Rose Garden' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Rose Glory requires research.
Canna 'Rose Ribbons' is a small Crozy Group cultivar, with green leaves and pink flowers.