Callitropsis
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 Callitropsis nootkatensis
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Callitropsis (synonym Xanthocyparis) is a genus of two species of cypresses in the family Cupressaceae, one native to western North America, the other native to Vietnam in southeast Asia.
There are two species (but see also below):
- Callitropsis nootkatensis - Nootka Cypress
- Callitropsis vietnamensis - Vietnamese Golden Cypress
Farjon et al. (2002) described the new genus Xanthocyparis, as containing the newly discovered Vietnamese Golden Cypress Xanthocyparis vietnamensis and the Nootka Cypress Xanthocyparis nootkatensis; the treatment has many arguments in its favour, as while they are not related to Chamaecyparis, neither do they fit fully in Cupressus despite the many similarities.
Little et al. (2004), while confirming the above relationship with further evidence, pointed out that an earlier nomenclatural combination in the genus Callitropsis existed, as Callitropsis nootkatensis (D.Don) Oersted, published in 1864 but overlooked or ignored by other subsequent authors. Little et al. therefore synonymised Xanthocyparis with Callitropsis, the correct name for these species under the ICBN when treated in a distinct genus. The name Xanthocyparis has now been proposed for conservation (Mill & Farjon 2006), but until that is decided on at the 2011 International Botanical Congress, it is correctly classified as Callitropsis.
[edit] See also
Cupressus, a closely related genus. The genetic evidence presented in Little et al. (2004) suggests that the North American species of this genus are more closely related to Callitropsis than they are to the European and other Asian Cupressus species; these species have very recently been transferred to Callitropsis by Little (2006).
[edit] References
- Gadek, P. A., Alpers, D. L., Heslewood, M. M., & Quinn, C. J. (2000). Relationships within Cupressaceae sensu lato: a combined morphological and molecular approach. American Journal of Botany 87: 1044–1057. Abstract
- Farjon, A., Hiep, N. T., Harder, D. K., Loc, P. K., & Averyanov, L. (2002). A new genus and species in the Cupressaceae (Coniferales) from northern Vietnam, Xanthocyparis vietnamensis. Novon 12: 179–189.
- 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
- Little, D. P. (2006). Evolution and circumscription of the true Cypresses. Syst. Bot. 31(3): 461-480.
- Mill, R. R. and Farjon, A. (2006). Proposal to conserve the name Xanthocyparis against Callitropsis Oerst. (Cupressaceeae). Taxon 55(1): 229-231.
- Gymnosperm Database: Callitropsis (as Xanthocyparis)
