Canna 'Red Simplex' is a medium-sized Foliage Group cultivar, with green leaves and red flowers.
Red Spiritiae is a synonym of The President.
Red Stripe is a synonym of Auguste Ferrier.
Canna 'Red Tiger' is a medium-sized Crozy Group cultivar, with variegated leaves and red flowers.
Canna 'Red Tyrol' is a small Crozy Group cultivar, with dark leaves and red flowers.
Canna 'Red Velvet' is a tall Foliage Group cultivar, with variegated leaves and red flowers.
Red Wine requires research.
reevesii is a synonym of flaccida.
reflexa Nees ex D.Dietr. is a synonym of pedunculata Sims.
Regal Red is a synonym of indica f. Regal Red.
Canna 'Reichskanzler Fürst Hohenlohe' is a medium-sized Crozy Group cultivar, with green leaves and yellow flowers.
Reign of Stuttgart requires research.
Reine Charlotte is a synonym of Kønigen Charlotte.
Rendatleri requires research.
Rendatleri rotundifolia vera requires research.
Canna 'Rene' is a small Crozy Group cultivar, with dark leaves and pink flowers.
Restormel requires research.
Revol Massot requires research.