Pinus leiophylla
Pinus leiophylla | |
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Pinus leiophylla subsp. chihuahuana, Bird Rock, Chiricahua National Monument, Arizona | |
Scientific classification ![]() | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Division: | Pinophyta |
Class: | Pinopsida |
Order: | Pinales |
Family: | Pinaceae |
Genus: | Pinus |
Subgenus: | P. subg. Pinus |
Section: | P. sect. Trifoliae |
Subsection: | P. subsect. Australes |
Species: | P. leiophylla
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Binomial name | |
Pinus leiophylla | |
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Natural range |
Pinus leiophylla, commonly known as Chihuahua pine,[2] smooth-leaf pine,[3][4] and yellow pine[4] (in Mexico, tlacocote and ocote chino), is a tree with a range primarily in Mexico, with a small extension into the United States in southeast Arizona and southwest New Mexico. The Mexican range extends along the Sierra Madre Occidental and Sierra Madre del Sur from Chihuahua to Oaxaca, from 29° North Lat. to 17°, between 1600 and 3000 meters altitude. It requires about a rainfall 600 to 1000 mm a year, mostly in summer. It tolerates frosts in winter.
Description[]
This member of family Pinaceae grows to the height of 20–30 m (66–98 ft) with a trunk diameter of 35–80 cm (14–31 in). The needles are in bundles of three to five, 5–10 cm (2–4 in) long, or rarely to 15 cm or 6 in, and are a bright glossy green to yellowish-green. The cones are ovoid, 4–7 cm (1+1⁄2–2+3⁄4 in) long, or rarely to 8 cm or 3+1⁄4 in, and borne on a 1–2 cm (1⁄2–3⁄4 in) long stalk; they are unusual in taking about 30–32 months to mature, a year longer than most other pines. The bark is gray-brownish, and fissured.
Subspecies[]
There are two subspecies (treated by some botanists as distinct species, by others as just varieties):
- Pinus leiophylla subsp. leiophylla. Needles slender (0.5–0.9 mm), in fives. It occurs in the southern part of the range, from Oaxaca to Durango, is not frost tolerant, and grows in relatively high rainfall conditions.
- Pinus leiophylla subsp. chihuahuana. Needles stouter (0.9–1.3 mm), in threes. It occurs in the northern part of the range, from Durango to Arizona, tolerates frost down to about −10 °C to −15 °C, and very dry conditions. The needle differences are adaptations to these harsher conditions. Synonyms Pinus chihuahuana, Pinus leiophylla var. chihuahuana.[5]
Habitat and ecology[]
This species often grows in mixed in stands with several other pines and/or junipers, in Arizona most often with Apache Pine and Alligator Juniper, but also grows in pure stands. Its habitat is prone to wildfire, and the species shows some adaptations unusual among pines to cope with this; if the crown is destroyed by fire, the trunk, protected by its thick bark, will send out new shoots to re-grow a new crown. The only other pines to do this are Pitch Pine (P. rigida) and Canary Island Pine (P. canariensis). As none of these are species particularly closely related to each other, the adaptation has probably arisen independently in each, an example of convergent evolution.
Cultivation and uses[]
The wood of the Pinus leiophylla is hard, dense and strong. It is used for construction, firewood, and railroad ties. In South Africa and Queensland, Australia there are big extensions of this tree planted. It is planted commercially in Kenya, Malawi, Zimbabwe, Zambia at high altitudes.
References[]
- ^ Farjon, A. (2013). "Pinus leiophylla". IUCN Red List of Threatened Species. 2013: e.T42376A2976226. doi:10.2305/IUCN.UK.2013-1.RLTS.T42376A2976226.en.
- ^ "Pinus leiophylla". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved February 11, 2012.
- ^ Pinus leiophylla was originally described and published in Linnaea 6:354. 1831. "Pinus leiophylla". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved February 10, 2012.
- ^ Jump up to: a b Michel H. Porcher (1995–2020). "Sorting Pinus names". Multilingual Multiscript Plant Name Database. Retrieved February 10, 2012.
- ^ 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. 90. ISBN 978-1-4027-3875-3.
External links[]
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Wikimedia Commons has media related to Pinus leiophylla. |
- County Distribution in Arizona, from plants.usda.gov
- County Distribution in New Mexico, from plants.usda.gov
- Interactive Distribution Map of Pinus leiophylla, from plantmaps.com
- IUCN Red List least concern species
- Pinus
- Trees of Mexico
- Trees of Oaxaca
- Trees of Puebla
- Trees of the Southwestern United States
- Trees of Durango
- Trees of Chihuahua (state)
- Trees of the South-Central United States
- Flora of Northeastern Mexico
- Plants described in 1831
- Trees of temperate climates
- Drought-tolerant trees
- Least concern plants
- Flora of the Sierra Madre Occidental