Rubra Superbissima
Canna 'Rubra Superbissima' is a tall Foliage Group cultivar, with dark leaves and red flowers.
Rubricaulis
Rubricaulis requires research.
rubricaulis Link
rubricaulis Link is a synonym of indica var. indica.
Ruby
Ruby requires research.
Ruby Cole
Canna 'Ruby Cole' is a small Crozy Group cultivar, with green leaves and pink flowers.
Ruby Crout
Ruby Crout requires research.
Russian Lance
Russian Lance is a synonym of Rubra nerva.
Russian Red
Canna 'Russian Red' is a tall Foliage Group cultivar, with dark leaves and red flowers.