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.
Roitelot is a synonym of Roitelet.
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.
Roongkarn requires research.
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.
Rosa Superba requires research.
Canna 'Rosalind' is a small Premier Group cultivar, with green leaves and multi-coloured flowers.
Rosalinda is a synonym of Frau Gartenburg.
Rosalinde is a synonym of Frau Gartenburg.
Rosamond Cole is a synonym of Rosemond Coles.
Rosamond Coles requires research.
Rosamund requires research.
Rosamund Cole is a synonym of Rosemond Coles.