Canary Bird is a synonym of Austria.
Canna Lily is a synonym of Canna.
Cannova Red is a synonym of Cannova Red Shades.
Caribbean is a synonym of indica var. indica.
Carman is a synonym of Eureka.
Carmen is a synonym of Eureka.
carnea Roscoe is a synonym of indica var. indica.
Caroni is a synonym of glauca f. Caroni.
Cattleya is a synonym of Allemania.
cearensis Huber. is a synonym of indica var. indica.
Centenaire is a synonym of Centenaire de Rozain-Boucharlat.
Centenaire de Rozain Boucharlat is a synonym of Centenaire de Rozain-Boucharlat.
Centenaire de Rozain-Bourcharlat is a synonym of Centenaire de Rozain-Boucharlat.
Centennial is a synonym of Merle Cole.
Chaméléon is a synonym of Chameleon.
Chanteclerc is a synonym of Chanteclair.
Chanticleer is a synonym of Chanteclair.
chinensis Willd. is a synonym of indica var. indica.
Chinese is a synonym of indica var. indica.
Chinese Choral is a synonym of Chinese Coral.