Torrey pine

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Torrey pine
Torrey Pine at Santa Rosa Island.jpg
A Torrey pine on the northeast coast of Santa Rosa Island, California
Status TNC G1.svg
Critically Imperiled  (NatureServe) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Pinaceae
Genus: Pinus
Subgenus: P. subg. Pinus
Section: P. sect. Trifoliae
Subsection: P. subsect. Ponderosae
Species:
P. torreyana
Binomial name
Pinus torreyana
Pinus torreyana range map 2.png
Natural range of Pinus torreyana

The Torrey pine (Pinus torreyana) is a rare pine species in California, United States. It is a critically endangered species growing only in coastal San Diego County, and on Santa Rosa Island, offshore from Santa Barbara in Santa Barbara County. [3] The Torrey pine is endemic to the California coastal sage and chaparral ecoregion. [4] [5]

Contents

Taxonomy

The species epithet torreyana is named for John Torrey, an American botanist, after whom the coniferous genus Torreya is also named. [6]

Description

Pinus torreyana is a broad, open-crowned pine tree growing to 8–17 meters (26–56 ft) tall in the wild, with 25–30 centimeters (9.8–11.8 in) long leaves ('needles') in groups of five. The cones are stout and heavy, typically 8–15 cm (3.1–5.9 in) long and broad, and contain large, hard-shelled, but edible, pine nuts. [4] Like all pines, its needles are clustered into 'fascicles' that have a particular number of needles for each pine species; in the Torrey pine there are five needles in each fascicle. [7] [8] Like all pines, it has strobili, structures that function as a flower but look like a small cone, which for the Torrey pine look like a yellow bud in a male strobilus and like a small red cone in a female. [9] [10]

Torrey pines are sometimes afflicted with witch's broom (or "gorilla's nest"), [11] an unusually dense cluster of needles that looks somewhat like a bird's nest, caused by disease or other causes. [12] [13]

There are two subspecies or varieties. These are said to be distinguished by the following characteristics, as well as possibly differing in the terpenoid (beta-phellandrene, limonene, cineole, etc.) profile. [14]

ImageSubspeciesDescriptionDistribution
Pinus torreyana at State Reserve.jpg Pinus torreyana var. torreyana (Kral 1993)There is much space between the branches. The leaf color is said to be generally gray-yellow-green. The cones are generally smaller than 13.5 cm (5.3 in) in width. The sharp tips at the end of the scales are generally less than 6 mm (0.24 in) in length. The seed is generally less than 11 mm (0.43 in) wide, and light to dark brown in color. [15] Considered a Critically Imperiled Subspecies by NatureServe. [16] coast at Del Mar in San Diego County
Pinus torreyana insularis tree.jpg Pinus torreyana var. insularis(Haller) Silba 1990The branches are crowded together. The leaf color is gray-blue-green. The cones are generally larger than 13.5 cm (5.3 in) in width. The sharp tips at the end of the scales are generally larger than 6 mm (0.24 in) in length. The seed is larger than 11mm wide, medium brown to more-or-less black. [17] Considered a Critically Imperiled Subspecies by NatureServe. [18] Santa Rosa Island

Distribution

The extant population of Pinus torreyana is restricted to trees growing in a narrow strip along the Southern California coast in San Diego. [19] There is also a population of the variety Pinus torreyana var. insularis in two groves on Santa Rosa Island, a California Channel Island off the coast of Santa Barbara. [20] [21] The presence of Torrey pines along the semi-arid coast of San Diego and Santa Rosa Island (rainfall less than 15 inches per year) is probably a relict population of a much more extensive Ice Age distribution. Coastal fog during spring and summer along the San Diego and Santa Rosa Island coast provides just enough moisture to supplement the fairly low winter rainfall, allowing for survival of the species in the wild habitat zone. [22]

Ecology

The native habitat of Pinus torreyana is coastal sage scrub, a plant community, growing slowly in dry, sandy soil. The root system is extensive. A tiny seedling may quickly send a taproot down 60 centimeters (24 in) seeking moisture and nutrients. A mature tree may have roots extending 75 meters (246 ft). Exposed trees battered by coastal winds are often twisted into beautiful sculptural shapes resembling large bonsai, and rarely exceed 12 m (39 ft) tall.

The seeds are eaten by birds and rodents. [23] Like most pine tree species, the seeds have a wing attached to them, but in this species it is papery, breaks off easily, and is entirely non-functional, so this tree is entirely reliant upon animals to disperse its seeds. The scrub jay ( Aphelocoma californica ) is the most important species when it comes to dispersal of the seeds (on the mainland). Scrub jays and perhaps also squirrels are thought to be spreading the species into adjacent parklands from gardens around San Diego. [24] [25]

The caterpillars of the moth Gloveria arizonensis have been confirmed to feed on this tree in the wild. [25]

Stratification, which is the process of subjecting seeds to (moist) cold, encourages germination in Torrey pine seeds [26] [27]

Uses

Food

The pine nuts were once eaten by the Kumeyaay tribe of Native American people. [23] [24]

Cultivation

Although considered endangered in the wild, Torrey pine is often planted as an ornamental tree around San Diego, coastal and inland southern California, and even the Central Valley. [24] A single tree planted in a suburb of San Diego in the 1940s or 1950s has grown tall and straight, and to a large size, 108 feet (33 m). [28] Shipley Nature Center states it can grow to 148 ft (45 m) in height in cultivation. [29] [30] It is sold by at least ten different plant nurseries in California as of 2020. [25]

Forestry

Pinus torreyana has been considered as a plantation tree for forestry use in Australia, New Zealand and Kenya. [31]

Culture

In San Diego County it is considered a local icon, where it lends its name to Torrey Pines State Reserve, Torrey Pines State Beach, Torrey Pines Golf Course, Torrey Pines High School, and Torrey Pines Gliderport, as well as numerous local roads and businesses (e.g., Torrey Pines Bank, [32] Torrey Pines Property Management Company, [33] Torrey Pines Landscape Company, [34] and Torrey Pines Law Group. [35] )

Conservation

There is some disagreement about the total population of Pinus torreyana. In general, only the populations in Torrey Pines State Reserve (TPSR) and on Santa Rosa Island are deemed to count as the wild population, not the trees planted around San Diego and wider California. In the 1970s it was estimated that the population in the TPSR and on Santa Rosa Island was about 9,000 individuals, but many of these trees have since died due to forest fires, drought and a series of infestations of a bark beetle, as well as being stressed by air pollution. There were only a hundred trees surviving in the early 20th century. As of 2016 it is thought by the California Native Plant Society that the population of this species is some 3,000 individuals. [24] In 2011, Aljos Farjon, assessing the conservation status of this species for the IUCN, estimated that the total population of P. torreyana was 4,500 individuals. He states that there is a slow decline of the numbers, especially of the trees not found within the TPSR on the mainland. [1]

The Torrey pine is protected by a city tree ordinance in Del Mar, near the native habitat, and construction projects and citizens require a permit for its removal. [36]

Related Research Articles

<span class="mw-page-title-main">Pine</span> Genus of plants in the conifer family Pinaceae

A pine is any conifer tree or shrub in the genus Pinus of the family Pinaceae. Pinus is the sole genus in the subfamily Pinoideae.

<i>Pinus sabiniana</i> Pine tree found in North America

Pinus sabiniana, with vernacular names including towani pine, foothill pine, gray pine, bull pine, and digger pine, is a pine endemic to California in the United States. Some sources discourage using the name "digger pine," considering it pejorative.

<i>Pinus flexilis</i> Pine tree found in North America

Pinus flexilis, the limber pine, is a species of pine tree-the family Pinaceae that occurs in the mountains of the Western United States, Mexico, and Canada. It is also called Rocky Mountain white pine.

<i>Pinus contorta</i> Species of plant

Pinus contorta, with the common names lodgepole pine and shore pine, and also known as twisted pine, and contorta pine, is a common tree in western North America. It is common near the ocean shore and in dry montane forests to the subalpine, but is rare in lowland rain forests. Like all pines, it is an evergreen conifer.

<span class="mw-page-title-main">Coulter pine</span> Pine tree found in North America

Coulter pine, or big-cone pine, is a native of the coastal mountains of Southern California in the United States and northern Baja California in Mexico. Isolated groves are found as far north as Clearlake, California on the flanks of Mt. Konocti and Black Diamond Mines Regional Preserve. It is named after Thomas Coulter, an Irish botanist and physician. The Coulter pine produces the heaviest cone of any pine tree, up to 5 kg (11 lb) and among conifers is exceeded only by the cones of Araucaria bidwillii.

<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>Pinus ponderosa</i> Species of large pine tree in North America

Pinus ponderosa, commonly known as the ponderosa pine, bull pine, blackjack pine, western yellow-pine, or filipinus pine is a very large pine tree species of variable habitat native to mountainous regions of western North America. It is the most widely distributed pine species in North America.

<span class="mw-page-title-main">Torrey Pines State Natural Reserve</span> State park in California

Torrey Pines State Natural Reserve is 2,000 acres (810 ha) of coastal state park located in San Diego, California, off North Torrey Pines Road. Although it is located within San Diego city limits, it remains one of the wildest stretches of land (8 km²) on the Southern California coast. It is bordered immediately on the south by Torrey Pines Municipal Golf Course and on the north by the city of Del Mar. The reserve was designated a National Natural Landmark in 1977.

<span class="mw-page-title-main">Island scrub jay</span> Species of bird

The island scrub jay, also known as the island jay or Santa Cruz jay, is a bird in the genus, Aphelocoma, which is endemic to Santa Cruz Island off the coast of Southern California. Of the over 500 breeding bird species in the continental U.S. and Canada, it is the only insular endemic landbird species.

<i>Bergerocactus</i> Genus of cacti from North America

Bergerocactus emoryi is a species of cactus, known commonly as the golden-spined cereus, golden snake cactus, velvet cactus or golden club cactus. It is a relatively small cactus, but it can form dense thickets or colonies, with the dense yellow spines giving off a velvety appearance when backlit by the sun. From April to May, yellow, green-tinged flowers emerge, which transform into reddish, globular fruit. This species is native to the California Floristic Province, and is found in northwestern Baja California and a small part of California, in San Diego County and on the southern Channel Islands. Where the Mediterranean climate of the California Floristic Province collides with the subtropical Sonoran Desert near El Rosario, hybrids with two other species of cacti are found. It is the sole member of the monotypic genus Bergerocactus, named after German botanist Alwin Berger.

<span class="mw-page-title-main">Torrey Pines State Beach</span> State park in California, United States

Torrey Pines State Beach is a public beach located in the San Diego, California community of Torrey Pines, south of Del Mar and north of La Jolla. Coastal erosion from the adjacent Torrey Pines State Reserve makes for a picturesque landscape. It is a local favorite among surfers and remains a quintessential Southern California beach. Occurrences of bioluminescence in the waters near the beach have been noted.

<span class="mw-page-title-main">Coastal sage scrub</span> Shrubland plant community of California

Coastal sage scrub, also known as coastal scrub, CSS, or soft chaparral, is a low scrubland plant community of the California coastal sage and chaparral subecoregion, found in coastal California and northwestern coastal Baja California. It is within the California chaparral and woodlands ecoregion, of the Mediterranean forests, woodlands, and scrub biome.

<span class="mw-page-title-main">Closed-cone conifer forest</span>

A Closed-cone conifer forest or woodland is a plant community occurring in coastal California and several offshore islands. The forests typically have a single-aged single-species conifer overstory with dense ladder fuels. Overstory species include coulter pine, monterey pine, bishop pine, shore pine, and several endemic cypresses, species which generally rely on fire to open their cones and release seeds. Closed-cone forests often grow in low nutrient and/or stressed soils, which can lead to slow growth.

Rancho Santa Maria de Los Peñasquitos was a 8,486-acre (34.34 km2) Mexican land grant in present-day southwestern San Diego County, California given in 1823 to Francisco María Ruiz. The name means "Saint Mary of the Little Cliffs". It encompassed the present-day communities of Mira Mesa, Carmel Valley, and Rancho Peñasquitos in northern San Diego city, and was inland from the Torrey Pines State Natural Preserve bluffs.

<i>Ceanothus verrucosus</i> Species of flowering plant

Ceanothus verrucosus is a species of shrub in the family Rhamnaceae known by the common names wart-stem ceanothus, barranca brush, coast lilac and white coast ceanothus. It is endemic to northwestern Baja California and San Diego County, where it grows in coastal sage scrub and coastal succulent scrub habitats. It is considered a rare species north of the international border, as most of the valuable coastal land that hosts this plant in the San Diego area has been claimed for development. In California, several extant populations still remain scattered around the region, such as one protected at Torrey Pines.

<span class="mw-page-title-main">California coastal sage and chaparral</span> Mediterranean forests, woodlands, and scrub ecoregion in Mexico and the United States

The California coastal sage and chaparral is a Mediterranean forests, woodlands, and scrub ecoregion located in southwestern California and northwestern Baja California (Mexico). It is part of the larger California chaparral and woodlands ecoregion.

Guy L. Fleming was an American naturalist whose conservation work led to the founding of Torrey Pines State Natural Reserve, now a 2000-acre protected coastal area of La Jolla, San Diego. The Torrey pine, Pinus torreyana, is the rarest pine species in the United States.

The wildlife of the Channel Islands of California is wide and diverse, including many endemic species. While the land wildlife is slightly limited, there being only one large, naturally predatory, and native mammal, the small island fox, marine life can include anything from kelp forests to great white sharks.

<i>Pinus torreyana <span style="font-style:normal;">subsp.</span> torreyana</i> Subspecies of plant

Pinus torreyana subsp. torreyana is a subspecies of the critically endangered Torrey pine in the family Pinaceae. It is native to California, and grows only in the coastal region of San Diego County, California.

References

  1. 1 2 Farjon, A. (2013). "Pinus torreyana". IUCN Red List of Threatened Species . 2013: e.T42424A2979186. doi: 10.2305/IUCN.UK.2013-1.RLTS.T42424A2979186.en . Retrieved November 11, 2021.
  2. ↑ "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved April 20, 2022.
  3. ↑ "Santa Rosa Island". Channel Islands. National Park Service. Retrieved January 30, 2018.
  4. 1 2 "Pinus torreyana Parry ex Carrière". Ucjeps.berkeley.edu. Retrieved August 9, 2013.
  5. ↑ C. Michael Hogan (September 11, 2008). "Torrey Pine (Pinus torreyana)". GlobalTwitcher.com. Archived from the original on May 25, 2012. Retrieved August 9, 2013.
  6. ↑ Lisa (September 22, 2010). "Tree Identification: Pinus torreyana - Torrey Pine". Lh2treeid.blogspot.com. Retrieved August 9, 2013.
  7. ↑ Earle, Christopher J., ed. (2018). "Pinus torreyana". The Gymnosperm Database. Retrieved August 6, 2013.
  8. ↑ "Chaparral and Riparian Plants". Sci.sdsu.edu. Retrieved August 6, 2013.
  9. ↑ "Natural Treasure: The One and Only Torrey Pine". Naturaltreasureucsd.blogspot.com. February 7, 2011. Retrieved August 6, 2013.
  10. ↑ "Life Cycle - torreypinedo2". Sites.google.com. July 22, 2011. Retrieved August 6, 2013.
  11. ↑ jiobrien. "Torrey Pine with witch's broom". Archived from the original on April 5, 2012. Retrieved May 4, 2014. The witch's broom or gorrila's nest is an abnormal area of growth on the tree of uncertain origin.
  12. ↑ "Welcome to My Garden!: Torrey Pines State Reserve". Loresgardens.blogspot.com. August 17, 2008. Retrieved August 6, 2013.
  13. ↑ "Torrey Pine". Project Noah. Retrieved August 6, 2013.
  14. ↑ Haller, J. Robert; Vivrette, Nancy J. (2012). "Pinus torreyana in Jepson Flora Project (eds.)". Jepson eFlora. Regents of the University of California . Retrieved September 28, 2020.
  15. ↑ Haller, J. Robert; Vivrette, Nancy J. (2012). "Pinus torreyana subsp. torreyana in Jepson Flora Project (eds.)". Jepson eFlora. Regents of the University of California . Retrieved September 28, 2020.
  16. ↑ "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved April 20, 2022.
  17. ↑ Haller, J. Robert; Vivrette, Nancy J. (2012). "Pinus torreyana subsp. insularis in Jepson Flora Project (eds.)". Jepson eFlora. Regents of the University of California . Retrieved September 28, 2020.
  18. ↑ "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved April 20, 2022.
  19. ↑ Moore, Gerry; Kershner, Bruce; Craig Tufts; Daniel Mathews; Gil Nelson; Spellenberg, Richard; Thieret, John W.; Terry Purinton; Block, Andrew (2008). National Wildlife Federation Field Guide to Trees of North America. New York: Sterling. p. 84. ISBN   978-1-4027-3875-3.
  20. ↑ "Pinus torreyana Parry ex Carrière subsp. insularis J. R. Haller". Ucjeps.berkeley.edu. Retrieved August 9, 2013.
  21. ↑ Earle, Christopher J., ed. (2018). "Pinus torreyana". The Gymnosperm Database. Retrieved May 4, 2014.
  22. ↑ Williams, A. Park; Still, Christopher J.; Fischer, Douglas T.; Leavitt, Steven W. (2008). "The influence of summertime fog and overcast clouds on the growth of a coastal Californian pine: A tree-ring study". Oecologia. 156 (3): 601–611. Bibcode:2008Oecol.156..601W. doi:10.1007/s00442-008-1025-y. PMID   18368424. S2CID   11172462.
  23. 1 2 Peattie, Donald Culross (1953). A Natural History of Western Trees. New York: Bonanza Books. pp. 96–97.
  24. 1 2 3 4 "Torrey Pine". Nature Collective. Retrieved April 22, 2020.
  25. 1 2 3 "Torrey Pine Pinus torreyana". Calscape. California Native Plant Society. Retrieved September 28, 2020.
  26. ↑ Esser, Lora L. (1993). "Pinus torreyana". Fire Effects Information System (FEIS). US Department of Agriculture (USDA), Forest Service (USFS), Rocky Mountain Research Station, Fire Sciences Laboratory. Retrieved August 6, 2013.
  27. ↑ Santiago (January 25, 2005). "germination of Torrey pines". Archived from the original on April 25, 2012. Retrieved August 9, 2013.
  28. ↑ Anne Krueger (February 6, 2007). "Residents say tree too big, too old for neighborhood". Union-Tribune Publishing Co. Archived from the original on January 31, 2017. Retrieved January 31, 2016. Houses replaced avocado groves on the East County land that surrounds the Torrey pine. Torrey pines are widely planted as an ornamental species
  29. ↑ "TORREY PINE HABITAT". Shipley Nature Center. Retrieved May 31, 2014.
  30. ↑ "Torrey Pine, Pinus torreyana". redOrbit. Conifers Reference Library. Retrieved May 31, 2014. The Torrey pine is planted as ornamental trees, with better soil and with controlled watering, it lends to being a fast growing tree to heights of 148 feet. This pine is drought tolerant as the tap roots can go as deep as 200 feet to find moisture. The tree is also shade tolerant.
  31. ↑ McMaster, Gregory Scott (1980). Patterns of reproduction in Torrey pine (Pinus torreyana) (Thesis). San Diego, California: San Diego State University.
  32. ↑ "Torrey Pines Bank". December 17, 2010. Retrieved August 6, 2013.
  33. ↑ "Torrey Pines Property Management Company, San Diego Property Management, Apartments for Rent in San Diego, CA" . Retrieved August 6, 2013.
  34. ↑ "San Diego Landscape Designers Contractors Torrey Pines Landscaping". Tplandscape.com. Retrieved August 6, 2013.
  35. ↑ "Torrey Pines Law Group". June 1, 2020. Retrieved June 1, 2020.
  36. ↑ "How can I cut my tree down?". City of Del Mar. Retrieved May 11, 2014.
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