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 'Romagna' is a medium-sized Italian Group cultivar, with green leaves and red flowers.
Canna 'Rosa' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Rosa Feurta' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Rose Beauty' is a medium-sized Crozy Group cultivar, with green leaves and pink flowers.
Canna 'Rose Garden' is a medium-sized Crozy Group cultivar, with green leaves and pink 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 '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.
Russian Lance is a synonym of Rubra nerva.