Xanthocyparis nootkatensis

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Xanthocyparis nootkatensis
Follaxe e un cono verde, nun exemplar do Mount Rainier N. P., Estado de Washington, EE. UU.
Follaxe e un cono verde, nun exemplar do Mount Rainier N. P., Estado de Washington, EE. UU.
Estado de conservación
Pouco preocupante (LC)
Pouco preocupante
Clasificación científica
Reino: Plantae
División: Pinophyta
Clase: Pinopsida
Orde: Pinales
Familia: Cupressaceae
Subfamilia: Cupressoideae
Xénero: Xanthocyparis
Especie: X. nootkatensis
Nome binomial
Xanthocyparis nootkatensis
Farjon & T. H. Nguyên, 2002
Área de distribución natural de X. nootkatensis

Área de distribución natural de X. nootkatensis
Véxase o texto

Xanthocyparis nootkatensis é unha especie de conífera da familia das cupresáceas (Cupressaceae), subfamilia das cupresoideas (Cupressoideae), unha das dúas incluídas no recente novo xénero Xanthocyparis.

Características[editar | editar a fonte]

Taxonomía[editar | editar a fonte]

A especie foi inicialmente descrita en 1824 polo botánico escocés David Don dentro do xénero Cupressus, como Cupressus nootkatensis.

En 1841 foi transferida ao xénero Chamaecyparis on the basis of its foliage being in flattened sprays, as in other Chamaecyparis, but unlike most (though not all) other Cupressus species.

However, this placement does not fit with the morphology and phenology of the cones, which are far more like Cupressus, like them maturing in two years, not one. Genetic evidence, published by Gadek et al.,[1] strongly supported its return to Cupressus and exclusion from Chamaecyparis.

More recently, Farjon et al. (2002) transferred it to a new genus Xanthocyparis, together with the newly discovered Vietnamese golden cypress Xanthocyparis vietnamensis; this species is remarkably similar to Nootka Cypress and 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.,[2][3] 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) Oerst., published in 1864 but overlooked or ignored by other subsequent authors. Little et al.[3] 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, and the 2011 International Botanical Congress followed that recommendation.[4]

In 2010, Mao et al. performed a more detailed molecular analysis and placed Nootka Cypress back in Cupressus.[5][6] However, this is disputed, as the tree would compose a monophyletic subgenus. "The argument that it warrants treatment as a monotypic genus is not without merit, in which case the correct name is Callitropsis nootkatensis."[7]

Sinónimos[editar | editar a fonte]

Ao longo da historia esta especice foi recoñecida polos sinónimos seguintes:[8]

  • Callitropsis nootkatensis (D.Don) Oerst. ex D.P.Little
  • Callitropsis nootkatensis (D. Don) Florin
  • Chamaecyparis nootkatensis (D. Don) Sudw.
  • Chamaecyparis nootkatensis (D.Don) Spach
  • Chamaecyparis nutkaensis Lindl. & Gordon
  • Cupressus americana Trautv.
  • Cupressus nootkatensis D.Don 1824 (basónimo)
  • Cupressus nutkatensis Hook.
  • Thuja excelsa Bong.
  • Thujopsis borealis Carrière
  • Thujopsis cupressoides Carrière
  • Thujopsis tchugatskoyae Carrière

Galería de imaxes[editar | editar a fonte]

Notas[editar | editar a fonte]

  1. 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
  2. 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
  3. 3,0 3,1 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.
  4. Mill, R. R. and Farjon, A. (2006). Proposal to conserve the name Xanthocyparis against Callitropsis Oerst. (Cupressaceeae). Taxon 55(1): 229-231.
  5. Mao, K., Hao, G., Liu, J., Adams, R. P. & Milne, R. I. 2010: Diversification and biogeography of Juniperus (Cupressaceae): variable diversification rates and multiple intercontinental dispersals. - In New Phytologist. 188(1):254-272.
  6. The Gymnosperm Database - Cupressus
  7. The Gymnosperm Database - Cupressus nootkatensis
  8. Xanthocyparis nootkatensis, na The Plant List.

Véxase tamén[editar | editar a fonte]

Bibliografía[editar | editar a fonte]

Outros artigos[editar | editar a fonte]

Ligazóns externas[editar | editar a fonte]