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Cupressus sempervirens is a medium-sized coniferous evergreen tree growing up to 35 m (115 ft) tall, with a conic crown with level branches and variably loosely hanging branchlets. [5]
As part of spiting the new world cypress species into the new genus Hesperocyparis it was moved out of Cupressus by Jim A. Bartel in 2009. [3] This split has not been universally accepted, [8] but as of 2024 Plants of the World Online (POWO) and World Flora Online (WFO) both list the new classification as accepted. [3] [9]
Hesperocyparis bakeri, previously known Cupressus bakeri, [4] [5] with the common names Baker cypress, Modoc cypress, or Siskiyou cypress, is a rare species of western cypress tree endemic to a small area across far northern California and extreme southwestern Oregon, in the western United States.
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]
Further research lead to two proposals to move it to a new genus for new world species of cypress, Neocupressus and Hesperocyparis. [3] As of 2024 Hesperocyparis sargentii is considered to be the correct classification by Plants of the World Online, [3] World Flora Online, [7] and the USDA Natural Resources Conservation Service PLANTS database. [8]
It is an IUCN Red List Critically Endangered species, and a California Native Plant Society Inventory of Rare and Endangered Plants listed Seriously endangered species. [ 1 ] [ 9 ] The entire native (world) population of the tree was reduced down to thirty to forty individual trees by the 2003 Cedar Fire .
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One exceedingly rare type, the Butano cypress, exists in only one grove, of about 10 acres. [13] This grove was described by William Dudley in the early 1900s. [13] All of the adult trees died during the CZU Lightning Complex fires in 2020. [13] Thousands of young Butano cypress seedlings were found growing in the grove in 2022. [13]
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