Christ's Light is a synonym of Trinacria Variegata.
Cincinnati is a synonym of Cincinnati Riot.
cinnabarina Bouché is a synonym of indica var. indica.
Citrus is a synonym of Yellow King Humbert.
coccinéa is a synonym of coccinea.
coccinea f. flaviflora Chodat & Hassl. is a synonym of coccinea.
coccinea var. bicolor Kraenzl. is a synonym of indica var. indica.
coccinea var. sylvestris (Roscoe) Regel is a synonym of tuerckheimii.
Cole’s Pale is a synonym of Coles Pale Superba.
Colonel Doods is a synonym of Colonel Dodds.
Color Clown is a synonym of Percy Lancaster.
commutata Bouché is a synonym of indica var. indica.
compacta Bouché is a synonym of indica var. indica.
concinna Bouché is a synonym of indica var. indica.
confusa J.W.Richardson & L.B.Sm. is a synonym of paniculata.
Coq d'Or is a synonym of Oiseau d'Or.
Coq d’Or is a synonym of Oiseau d'Or.
Cote d'Or is a synonym of Côte d'Or.
Count Horace de Choiseul is a synonym of Comte Horace de Choiseul.
Cream is a synonym of Ambassadour.