High Quality Content by WIKIPEDIA articles! Callitropsis (synonym Xanthocyparis) is a genus of cypresses in the family Cupressaceae, with several native to North America and one native to Vietnam in southeast Asia. Farjon et al. (2002) described the new genus Xanthocyparis to accommodate the new Vietnamese species X. vietnamensis and another species, X. nootkatensis, the Nootka Cypress, which had been formerly included in the genus Chamaecyparis as C. nootkatensis. This was based in part on the discovery that C. nootkatensis was more closely related to the genus Cupressus than to Chamaecyparis (Gadek et al. 2000). Little et al. (2004), while confirming the above relationship with further evidence, pointed out that as circumscribed by Farjon et al., Xanthocyparis included the type species of Callitropsis (Cupressus nootkatensis, a synonym of Chamaecyparis nootkatensis and Xanthocyparis nootkatensis).

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