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Hesperocyparis arizonica was given its first scientific name and described by Edward Lee Greene in 1882 as Cupressus arizonica, placing it in genus Cupressus. [3] [5] This description was soon after disputed by Maxwell T. Masters who, in 1896, published a journal article where he said it should be considered a subspecies of Cupressus benthamii with the variety name of arizonica. [3]
Members of Hesperocyparis were and still are placed in Cupressus by many authorities, but phylogenetic evidence supports a different affinity. A 2021 molecular study found Hesperocyparis to be the sister group to the genus Callitropsis (containing only the Nootka cypress), with this clade being sister to the Asian genus Xanthocyparis, containing only the Vietnamese golden cypress.
Neocupressus arizonica var. glabra (Sudw.) de Laub. (2009) (2009) Hesperocyparis glabra , known as the Arizona smooth bark cypress or smooth Arizona cypress , is a conifer native to the American Southwest, with a range stretching over the canyons and slopes in a somewhat wide vicinity around Sedona, Arizona .
Cupressus is one of several genera of evergreen conifers within the family Cupressaceae that have the common name cypress; for the others, see cypress. It is considered a polyphyletic group. Based on genetic and morphological analysis, the genus Cupressus is found in the subfamily Cupressoideae .
Cypress-pines (Callitris species), Australia and New Caledonia [15] False cypress (Chamaecyparis species), Asia and North America. [16] Fujian cypress (Fokienia hodginsii), southeastern China [17] Guaitecas cypress (Pilgerodendron uviferum), western Patagonia [18] and Tierra del Fuego [13] Japanese cypress (Chamaecyparis obtusa), East Asia
Cupressus arizonica subsp. stephensonii (C.B.Wolf) A.E.Murray (1982) Cupressus stephensonii C.B.Wolf (1948) Hesperocyparis stephensonii is a species of western cypress known as the Cuyamaca cypress that is found only in one very small area in Southern California .
Cupressaceae or the cypress family is a family of conifers. The family includes 27–30 genera (17 monotypic ), which include the junipers and redwoods , with about 130–140 species in total. They are monoecious , subdioecious or (rarely) dioecious trees and shrubs up to 116 m (381 ft) tall.
As of August 2021, it has only one species, Xanthocyparis vietnamensis, [3] native to Vietnam and southeast China. [2] It is commonly known as the Vietnamese golden cypress. The Nootka cypress, Cupressus nootkatensis or Callitropsis nootkatensis, was also placed in the genus, but this has been rejected.