Hesperocyparis

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Hesperocyparis
Hesperocyparis macrocarpa, Monterey cypress
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Pinophyta
Class: Pinopsida
Order:
Cupressales
Family: Cupressaceae
Subfamily:
Cupressoideae
Genus: Hesperocyparis
Bartel & R.A. Price
Type species
Hesperocyparis macrocarpa
(Hartweg ex Gordon) Bartel & Price
Species

See text

Synonyms
  • Neocupressus de Laub. nom. superfl.

Hesperocyparis (western cypress)[1] is a genus of trees in the family Cupressaceae, containing North American species otherwise assigned to the genus Cupressus.[2] They are found throughout western North America. Only a few species have wide ranges, with most being restricted-range endemics.

Taxonomy

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

Juniperus.[4]

As of 2024 Hesperocyparis is listed as the correct classification by Plants of the World Online,[5] World Flora Online,[6] and the Gymnosperm Database.[7] There is disagreement about this classification, with some scientists continuing to use Cupressus in preference to Hesperocyparis.[8][9]

At the species level there is also uncertainty as to the number of species. In part this is because the north west of Mexico has not been sufficiently surveyed to give enough information to definitively determine if a number of species there and in the southwestern United States are fully separate species or part of a species complex.[7]

Phylogeny

Stull et al. 2021[10][11]

Juniperus

Cupressus s.l.

Cupressus s.s.

Xanthocyparis vietnamensis
Farjon & Nguyên

Callitropsis nootkatensis (Don) Oersted

Hesperocyparis

H. bakeri (Jepson) Bartel (Modoc cypress)

H. macnabiana (Murray) Bartel (Macnab’s/Shasta cypress)

H. goveniana (Gordon) Bartel (Gowen cypress)

H. macrocarpa (Hartweg ex Gordon) Bartel (Monterey cypress)

H. sargentii Jepson (Sargent cypress)

H. glabra (Sudworth) Bartel (Smooth Arizona cypress)

H. arizonica (Greene) Bartel (Arizona cypress)

H. guadalupensis (Watson) Bartel (Guadalupe cypress)

H. montana (Wiggins) Bartel (San Pedro Martir cypress)

H. forbesii (Jepson) Bartel (Tecate cypress)

H. lusitanica (Miller) Bartel (Mexican cypress)

H. stephensonii (Jepson) Bartel (Cuyamaca cypress)

Additional species:[5]

References

  1. ^ USDA, NRCS (n.d.). "Hesperocyparis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 14 May 2015.
  2. ^ Robert P. Adams, Jim A. Bartel & Robert A. Price (2009). "A new genus, Hesperocyparis, for the cypresses of the Western Hemisphere" (PDF). Phytologia. 91 (1): 160–185.
  3. S2CID 232282918
    .
  4. ISBN 978-1-84246-634-6
    . Retrieved 18 February 2024.
  5. ^ a b "Hesperocyparis Bartel & R.A.Price". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 30 January 2024.
  6. ^ "Hesperocyparis Bartel & R.A.Price". World Flora Online. Retrieved 30 January 2024.
  7. ^ a b Earle, Christopher J. "Hesperocyparis (New World Cypresses) description". The Gymnosperm Database. Retrieved 30 January 2024.
  8. S2CID 266410521
    . Retrieved 13 February 2024.
  9. ISBN 9783527321414
    .
  10. S2CID 236141481
    .
  11. doi:10.6084/m9.figshare.14547354.v1
    .
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