Canna 'R. Wallace' is a small Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'Ra' is a medium-sized aquatic cultivar, equally at home as a water marginal or in the border, with green leaves and yellow flowers.
Canna 'Radio' is a tall Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'Reichskanzler Fürst Hohenlohe' is a medium-sized Crozy Group cultivar, with green leaves and yellow flowers.
Canna 'Rigoletto' is a medium-sized Italian Group cultivar, with green leaves and yellow flowers.
Canna 'River Avon' is a small aquatic cultivar, equally at home as a water marginal or in the border, with green leaves and yellow flowers.
Canna 'River Ouse' is a medium-sized aquatic cultivar, equally at home as a water marginal or in the border, with green leaves and yellow flowers.
Canna 'River Severn' is a medium-sized aquatic cultivar, equally at home as a water marginal or in the border, with green leaves and yellow flowers.
Canna 'River Thames' is a small aquatic cultivar, equally at home as a water marginal or in the border, with green leaves and yellow flowers.
Canna 'River Trent' is a medium-sized aquatic cultivar, equally at home as a water marginal or in the border, with green leaves and yellow flowers.