Hesperocyparis pygmaea

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Hesperocyparis pygmaea
Cupressus pygmaea, at Salt Point, Mendocino, California.jpg
Hesperocyparis pygmaea at Salt Point, Mendocino, California
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Pinophyta
Class: Pinopsida
Order: Cupressales
Family: Cupressaceae
Genus: Hesperocyparis
Species:
H. pygmaea
Binomial name
Hesperocyparis pygmaea
(Lemmon) Bartel
Cupressus pygmaea range map 4.png
Natural range of Cupressus pygmaea
Synonyms [1]
List
    • Callitropsis pygmaea (Lemmon) D.P.Little (2006)
    • Cupressus goveniana subsp. pygmaea (Lemmon) Bartel (1991)
    • Cupressus goveniana var. pygmaea Lemmon (1895)
    • Cupressus pygmaea (Lemmon) Sarg. (1901)
    • Cupressus silbae B.Huang bis (2008)
    • Hesperocyparis goveniana var. pygmaea (Lemmon) de Laub. (2012)
    • Neocupressus goveniana var. pygmaea (Lemmon) de Laub. (2009)

Hesperocyparis pygmaea, the Mendocino cypress or pygmy cypress, is a taxon of disputed status in the western cypress genus. It is endemic to certain coastal terraces and coastal mountain ranges of Mendocino and Sonoma Counties in northwestern California. It is a variable tree, and closely related to Hesperocyparis abramsiana and Hesperocyparis goveniana , enough to sometimes be considered conspecific with them.

Contents

Description

The foliage is a dull dark to light green color, with scale-like leaves 1–1.5 mm long, with the leaf tips not spreading; seedlings bear needle-like leaves 8–10 mm long. The cones are small, 11–24 mm long, and almost spherical, with six or eight scales arranged in opposite decussate pairs, with the bract visible as no more than a small lump or short spine on the scale. The seeds are 3–5 mm long, with a pair of small wings along the sides. [2] The cones remain closed on the trees for many years, until the trees are killed by a forest fire; after the tree is dead, the cones open to release the seeds which can then germinate successfully on the bare fire-cleared ground. [3]

The Mendocino cypress differs little from H. goveniana in morphology, with the most conspicuous difference in herbarium material being the usually glossy black seeds, unlike the dull brown seeds of H. goveniana, but even this character is not constant, with dull brown seeds found in the southernmost populations of H. pygmaea near Point Arena. [4] Preliminary genetic studies have shown some differences, with notably some plastid sequences (matK, rbcL, and trnL) suggesting a possible closer relationship to H. macrocarpa , though other sequences confirm its close relationship to H. goveniana. [5] In cultivation together with H. goveniana, it retains a very different crown shape, with a tall slender crown, contrasting with the broad, shrubby crown of H. goveniana; it also has darker green foliage (paler, yellow-green in H. goveniana). [4]

The largest recorded specimen is located in Mendocino County, with recorded dimensions of 43 m height, 2.13 m diameter, and 12 m crown spread, in 2000. [6]

Taxonomy

Hesperocyparis pygmaea was first described as a subspecies by J.G. Lemmon with the name Cupressus goveniana var. pygmaea in 1895. It was described as a species by Charles Sprague Sargent in 1901. [1] Sargent thought that the distinctness of the seeds from those of C. goveniana definitively showed it to be a species though its growth habits and form did not make it easy to identify. [7]

Its taxonomic status is a long standing matter of dispute between botanists. In the 20th century some treated Cupressus pygmaea as a distinct species, following Sargent, including Wolf (1948), [4] Griffin & Critchfield (1976), [8] and Lanner (1999). [3] Others treated it within Cupressus goveniana as either a variety (C. goveniana var. pigmaea Lemmon) [9] or a subspecies (C. goveniana subsp. pygmaea (Lemmon) A.Camus), including Camus (1914), [10] and the Jepson Manual (1993), [11] and one publication, the Flora of North America , did not distinguish it at all within C. goveniana. [12]

The spelling of the scientific name has also been confused. Lemmon's protologue at varietal rank used the spelling pigm a, a typographic error hand corrected to pigmaea, in the main description (BHL page 23343470) but pygmaea in the contents (BHL page 23343396). In raising the taxon to species rank, Sargent changed the spelling to pygmaea (BHL page 28545470), a legitimate change as a botanical name has no priority outside of the rank at which it is published (ICN Art. 11.2); this has been followed by most subsequent authors (including Camus in the first allocation to subspecific rank ), though a few subsequent authors have incorrectly used the spelling pigmaea at ranks other than varietal (e.g. Farjon 2005, [2] Little 2006 [5] ).

Disputes continued into the 2000s with Farjon agreeing that it should be part of C. goveniana in 2005. [2] Additionally moving the new world cypress species to different genuses was proposed three different times. In 2006 Damon P. Little proposed moving them to Callitropsis , but did not find wide acceptance. [5] [1] In 2009 two different classifications were proposed, Hesperocyparis and Neocupressus. [1]

As of 2024Hesperocyparis pygmaea is listed as the correct name in Plants of the World Online, [1] World Flora Online, [13] and the Gymnosperm Database. [6]

Distribution and habitat

The Mendocino cypress is highly variable in growth form, depending on soil conditions. In the pygmy forest plant community on poor, acidic, nutrient-starved podsol soils with drainage impeded by an iron hardpan, it is a stunted tree from 0.2–5 meters in height at maturity. When occurring in its pygmy form, it is sometimes called pygmy cypress. When growing on deep, well-drained soils it can be a large tree up to 30–50 meters in height and 1–2.4 m in trunk diameter. The bark is dark gray-brown, with stringy texture, and fissured on old trees. [2]

Mendocino cypress occurs in very limited ranges within only Mendocino County, on some of the historical lands of the Yuki Native American people. In Mendocino County the occurrence is in a discontinuous coastal terrace strip, primarily as a pygmy forest associated with bishop pine (Pinus muricata) and Mendocino shore pine (P. contorta var. bolanderi). Occurrences are typically below 500 m in elevation. [11] The Mendocino County official soils survey states that "While not formally recognized as a major forest cover type, the coastal portion of the survey area also includes bishop pine and Mendocino cypress (pygmy) forest types". [14]

Productivity

Along the Mendocino coastal terraces, whose geological age is approximately one million years, studies have been conducted of the biomass density and primary productivity of the Hesperocyparis pygmaea-dominated pygmy forest. [15] The terraces in this area extend a full five to ten kilometers inland from the Pacific Ocean.

In the Mendocino cypress pygmy forests, biomass was measured to range between 1.6 and 4.4 kilograms per square meter aboveground; moreover, net primary productivity was found to measure 180 to 360 grams per square meter per annum above the ground surface. Mean below-ground values are 3.5 kilograms biomass per square meter, productivity being 402 grams per meter per annum. The leaf-area ratio of the pygmy forest was estimated as 2.1 grams per square meter implying a high production efficiency per unit leaf area for an evergreen community (150 grams per meter aboveground ). According to Westman, productivity of the H. pygmaea forest lies within the range expected for open, dry woodlands. A similar community for which data is available is a pygmy conifer-oak scrubland in southern Arizona.

Related Research Articles

Cypress is a common name for various coniferous trees or shrubs of northern temperate regions that belong to the family Cupressaceae. The word cypress is derived from Old French cipres, which was imported from Latin cypressus, the latinisation of the Greek κυπάρισσος (kyparissos). Cypress trees are a large classification of conifers, encompassing the trees and shrubs from the cypress family (Cupressaceae) and many others with the word cypress in their common name. Many cypress trees have needle-like, evergreen foliage and acorn-like seed cones.

<i>Cupressus</i> Several genera of evergreen conifers

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. The common name "cypress" comes via the Old French cipres from the Latin cyparissus, which is the latinisation of the Greek κυπάρισσος (kypárissos).

<i>Hesperocyparis macrocarpa</i> Species of conifer

Hesperocyparis macrocarpa also known as Cupressus macrocarpa, or the Monterey cypress is a coniferous tree, and is one of several species of cypress trees endemic to California.

<i>Callitropsis nootkatensis</i> Species of conifer

Callitropsis nootkatensis, formerly known as Cupressus nootkatensis, is a species of tree in the cypress family native to the coastal regions of northwestern North America. This species goes by many common names including: Nootka cypress, yellow cypress, Alaska cypress, Nootka cedar, yellow cedar, Alaska cedar, and Alaska yellow cedar. The specific epithet nootkatensis is derived from its discovery by Europeans on the lands of a First Nation of Canada, the Nuu-chah-nulth people of Vancouver Island, British Columbia, who were formerly referred to as the Nootka.

<i>Pinus muricata</i> Species of conifer

Pinus muricata, the bishop pine, is a pine with a very restricted range: mostly in California, including several offshore Channel Islands, and a few locations in Baja California, Mexico. It is always on or near the coast.

<i>Hesperocyparis arizonica</i> Species of conifer

Hesperocyparis arizonica, the Arizona cypress, is a North American species of tree in the cypress family Cupressaceae, native to the southwestern United States and Mexico. Populations may be scattered rather than in large, dense stands.

<i>Hesperocyparis bakeri</i> Western North American species of conifer

Hesperocyparis bakeri, previously known Cupressus bakeri, 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.

<i>Hesperocyparis goveniana</i> Californian species of western cypress

Hesperocyparis goveniana commonly known as Californian cypress and Gowen cypress, is a species of western cypress that is endemic to a small area of coastal California near Monterey. It was formerly classified as Cupressus goveniana.

<i>Hesperocyparis guadalupensis</i> Island endemic species of western cypress tree

Hesperocyparis guadalupensis, commonly known as Guadalupe cypress, is a species of western cypress from Guadalupe Island in the Pacific Ocean off the western coast of Mexico's Baja Peninsula. It was previously known as Cupressus guadalupensis until 2009. It is a medium sized tree with fine green to blue-green foliage. In its native habitat it depends on water from the fogs that envelop the high northern half of the island. It became an endangered species due to feral goats living on Guadalupe Island that prevented new trees from growing for more than a century. In 2005 the goats were finally removed from its island home as part of an island restoration project. New trees are growing and other plants are beginning to recover though the future of the species is not yet assured. Guadalupe cypress is closely related to the vulnerable Tecate cypress which grows on the mainland in Baja California and southern California. It is used as an ornamental tree in Mediterranean climates, particularly in Europe, but has no significant human uses.

<i>Hesperocyparis abramsiana</i> Californian species of western cypress

The Santa Cruz cypress is a species of North American tree within the cypress family. The species is endemic to the Santa Cruz Mountains within the Santa Cruz and San Mateo counties of west-central California. The U.S. Fish and Wildlife Service listed the species on the Endangered Species Act in 1987 due to increasing threats from habitat loss and disruption of natural forest fire regimes. In 2016, the conservation status of the Santa Cruz cypress changed to Threatened. The cited reasoning was a decrease in threats against their habitat.

<i>Hesperocyparis lusitanica</i> Central American and Mexican species of western cypress

Hesperocyparis lusitanica, the Mexican cypress or cedar-of-Goa, is a species of cypress native to Mexico and Central America. It has also been introduced to Belize, Costa Rica and Nicaragua, growing at 1,200–3,000 metres (3,900–9,800 ft) altitude.

<span class="mw-page-title-main">Dwarf forest</span> Type of forest ecosystem

Dwarf forest, elfin forest, or pygmy forest is an uncommon ecosystem featuring miniature trees, inhabited by small species of fauna such as rodents and lizards. They are usually located at high elevations, under conditions of sufficient air humidity but poor soil. There are two main dwarf forest ecosystem types, involving different species and environmental characteristics: coastal temperate and montane tropical regions. Temperate coastal dwarf forest is common for parts of Southern California. Montane tropical forests are found across tropical highlands of Central America, northern South America and Southeast Asia. There are also other isolated examples of dwarf forests scattered across the world, while the largest dwarf forest is found in the Philippines.

<i>Hesperocyparis macnabiana</i> Species of flowering plant in the family

Hesperocyparis macnabiana is a species of western cypress in from California that was previously named Cupressus macnabiana.

<i>Hesperocyparis sargentii</i> Californian species of western cypress tree

Hesperocyparis sargentii is a species of conifer in the family Cupressaceae known by the common name Sargent's cypress. It is endemic to California, where it is known from Mendocino County southwards to Santa Barbara County. This taxon is limited to the Coast Range mountains. It grows in forests with other conifers, as well as chaparral and other local mountain habitat, usually in pure stands on serpentine soils. It generally grows 10 to 15 meters tall, but it is known to exceed 22 meters. On Carson Ridge in Marin County, as well as Hood Mountain in Sonoma County, the species comprises a pygmy forest of trees which do not attain heights greater than 240–360 cm due to high mineral concentrations in the serpentine soil.

<i>Hesperocyparis forbesii</i> Western North American species of western cypress

Hesperocyparis forbesii, with the common names Tecate cypress or Forbes' cypress, is a nonflowering, seed bearing tree species of western cypress native to southwestern North America in California and Baja California. It was formerly known as Cupressus forbesii.

<i>Hesperocyparis stephensonii</i> Californian species of western cypress

Hesperocyparis stephensonii is a species of western cypress known as the Cuyamaca cypress that is found only in two very small areas in Southern California and northwestern Baja California.

<i>Hesperocyparis nevadensis</i> Californian species of western cypress

Hesperocyparis nevadensis is a species of western cypress tree with the common name Paiute cypress native to a small area in the Sierra Nevada Mountains of California in the western United States. It was formerly known as Cupressus nevadensis.

<i>Hesperocyparis</i> Genus of conifers

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

<i>Hesperocyparis montana</i> Species of conifer

Hesperocyparis montana, commonly known as the San Pedro Mártir cypress or San Pedro cypress, is a species of conifer. It is a tree native to the Sierra de San Pedro Mártir of Baja California state in northwestern Mexico.

<i>Hesperocyparis revealiana</i> Species of conifer

Hesperocyparis revealiana is a rare Mexican species of conifer in the cypress family, is endemic to a small area of the State of Baja California in northwestern Mexico.

References

  1. 1 2 3 4 5 "Hesperocyparis pygmaea (Lemmon) Bartel". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 2 March 2024.
  2. 1 2 3 4 Farjon, Aljos (2005). A monograph of cupressaceae and sciadopitys. Kew, England: Royal botanic gardens. pp. 205, 272. ISBN   1-84246-068-4.
  3. 1 2 Lanner, Ronald M. (1999). Conifers of California (2. print ed.). Los Olives, California: Cachuma Press. pp. 176–177. ISBN   0-9628505-3-5.
  4. 1 2 3 Wolf, C. B.; Wagener, W. E. (1948). "The New World cypresses". Aliso. 1 (1): 195–205. doi: 10.5642/aliso.19480101.02 .
  5. 1 2 3 Damon P. Little (2006). "Evolution and circumscription of the true cypresses (Cupressaceae: Cupressus)". Systematic Botany . 31 (3): 461–480. doi:10.1600/036364406778388638. JSTOR   25064176.
  6. 1 2 Earle, Christopher J., ed. (2023). "Hesperocyparis pygmaea (Mendocino cypress) description". The Gymnosperm Database. Retrieved 4 March 2024.
  7. Sargent, Charles S. (1901). "New or Little Known North American Trees. III". Botanical gazette. 31 (4): 239–240. Retrieved 2 March 2024.
  8. Griffin, James R.; Critchfield, William B. (1976). Research Paper PSW-82: The Distribution of Forest Trees in California (Report). USDA Forest Service. Retrieved 5 March 2024.
  9. Lemmon, J. G. (1895). West-American Cone-Bearers. 3rd ed.
  10. Camus, A (1914). "Les Cyprès". Encyclopédie Économique de Sylviculture. 2: 50.
  11. 1 2 Bartel, Jim A. (1993). "Cupressus pigmaea subsp. pygmaea". In Hickman, James C. (ed.). The Jepson Manual: Higher Plants of California. University and Jepson Herbaria.
  12. Eckenwalder, James E. (1993). "Cupressus goveniana". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 2. New York and Oxford: Oxford University Press via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  13. "Hesperocyparis pigmaea (Lemmon) Bartel". World Flora Online . Retrieved 5 March 2024.
  14. "Woodland Management and Productivity". Soil Survey of Mendocino County, California, Western Part. National Cooperative Soil Survey. 1993. Archived from the original on 2006-09-23. Retrieved 2006-11-23.
  15. Westman, W. E. & Whittaker, R. H. (1975). The Pygmy Forest Region of Northern California: Studies on Biomass and Primary Productivity. Journal of Ecology 63 (2): 493-520. ISSN   0022-0477.

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