This genus was originally based upon a species collected in Peru by Richard Spruce in 1856 and published as C. decorticans in 1859 (Jour. Linn. Soc. 3: 200. 1859). Subsequently, C. leiophloea Ben. (Bull. Mus. Hist. Nat. Paris 27: 367. 1921) was described from French Guiana, C. huberiana Ducke (Arch. Jard. Bot. Rio de Janeiro 3: 257. 1922) from Brazil, C. surinamensis Brem. (Rec. Trav. Bot. Neerl. 31: 261. 1934) from Surinam, and C. erythroxylon Standi. (Publ. Field Mus. Bot. 22: 48-4. 1940) from Peru.
The extensive recent explorations in Venezuela by Maguire, Wurdack, et al. have revealed the presence of the genus in Venezuela, represented by two collections, at least one of which is an undescribed species.