Hesperocyparis sargentii

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Cupressus sargentii
)

Hesperocyparis sargentii

Apparently Secure  (NatureServe)[2]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Pinophyta
Class: Pinopsida
Order:
Cupressales
Family: Cupressaceae
Genus: Hesperocyparis
Species:
H. sargentii
Binomial name
Hesperocyparis sargentii
(
Jeps.
) Bartel (2009)
Natural range
Synonyms[3]
  • Callitropsis sargentii (Jeps.) D.P.Little (2006)
  • Cupressus sargentii Jeps. (1909)
  • Cupressus sargentii var. duttonii Jeps. (1923)
  • Neocupressus sargentii (Jeps.) de Laub. (2009)

Hesperocyparis sargentii is a species of

Sonoma County, the species comprises a pygmy forest of trees which do not attain heights greater than 240–360 cm (8–12 feet) due to high mineral concentrations in the serpentine soil.[4]

One notable population occurs in the Cedar Mountain Ridge area of Eastern

Alameda County
. According to Carl Wolf, who extensively studied the New World Cypress in the 1930s and 1940s, seed from the Cedar Mountain stand of Cupressus sargentii produced the most vigorous seedlings.

Like many of the New World Cupressaceae, Sargent cypress usually reproduces with the aid of wildfire, which cause an opening of the cones and exposure of bare mineral soil for seedling germination, though occasionally seeds will fall and germinate without fire, though such seems to be the exception rather than the rule. It is often the case that many trees in a particular stand will all be the same age, so that a sort of stratification occurs of different colonies all of the same age. Sargent cypress can begin producing cones as early as five or six years of age.[5]

Taxonomy

Hesperocyparis sargentii was scientifically described by the botanist Willis Linn Jepson in 1909 and given the name Cupressus sargentii.[3] He found the type specimen in the Mayacamas Mountains in northern California.[6] Jepson also identified a variety of the species, var. duttonii, in 1923, but this has not become widely accepted.[3] For almost 100 year the status of the species was not disturbed until in 2006 the first of several proposals to move it to, Callitropsis alongside Callitropsis nootkatensis. 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]

References

  1. doi:10.2305/IUCN.UK.2013-1.RLTS.T42258A2967745.en
    . Retrieved 15 November 2021.
  2. ^ NatureServe (2024). "Cupressus sargentii". Arlington, Virginia. Retrieved 15 February 2024.
  3. ^ a b c d e "Hesperocyparis sargentii (Jeps.) Bartel". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 15 February 2024.
  4. ^ Biohere, Hood Mountain Park
  5. ^ Wolf, C. B. & Wagener, W. E. (1948). The New World cypresses. El Aliso 1: 195-205.
  6. ^ Jepson, Willis Linn (1909). A Flora of California. San Francisco, California: Cunningham, Curtis & Welch. p. 61. Retrieved 16 February 2024.
  7. ^ "Hesperocyparis sargentii (Jeps.) Bartel". World Flora Online. Retrieved 16 February 2024.
  8. ^ Hesperocyparis sargentii, USDA Natural Resources Conservation Service PLANTS Profile, 16 February 2024

Further reading

External links

Wikimedia Commons has media related to Cupressus sargentii.
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