A genus of c. 16-20 species. Recent genetic evidence (* Little, D. P., Schwarzbach, A. E., Adams, R. P. & Hsieh, Chang-Fu. 2004. The circumscription and phylogenetic relationships of Callitropsis and the newly described genus Xanthocyparis (Cupressaceae). American Journal of Botany 91 (11): 1872–1881. Abstract) shows that the New World Cupressus are less closely related to the Old World Cupressus than previously thought, being more closely related to Callitropsis and Juniperus than to the rest of Cupressus. A change in generic classification for these species is likely in the near future, either to Callitropsis or to a new genus.