rubra (Aiton) Willd.
rubra (Aiton) Willd. is a synonym of indica var. indica.
Rubra Nerva
Canna 'Rubra Nerva' is a medium-sized Foliage Group cultivar, with dark leaves and red flowers.
Rubra Perfecta
Canna 'Rubra Perfecta' is a medium-sized Foliage Group cultivar, with dark leaves and red flowers.
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.