Pinus teocote
| Pinus teocote | ||||||||||||
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Pinus teocote |
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| Scientific name | ||||||||||||
| Pinus teocote | ||||||||||||
| Different ex Schltdl. & Cham. |
Pinus teocote is a species of pine ( Pinus ). In addition to the production of timber, this species, which is onlynativeto Mexico , is also used to produce resin.
features
Pinus teocote is a medium-sized tree and reaches heights of 8 to 25 meters. In adult trees, the branches are horizontal to slightly hanging and form a dense, rather rounded crown . In young trees, the crown is rather dense and pyramidal. In mature trees, the bark is thick, rough, dark gray-brown, divided into irregular oblong plates by deep cracks. The bark on young trees is thin, scaly and reddish. The twigs are smooth when young, but soon rough with thin, reddish scales.
The needle leaves stand in bundles on short shoots in threes, rarely four; the sheaths are dark brown, 5 to 10 mm long and persistent. The needle leaves are thick, stiff, 8 to 15 cm long, often over a mm thick. The edge is finely sawn. There are two to five, rarely more, resin canals. There are two closely spaced but demarcated vascular bundles .
The cones are long ovoid, shiny brown with cross-keeled cone scales. They stand in groups of two, three, or four, on thick, short, stiff stems.
The cones are egg-shaped to conical. They are 4 to 7 cm long, light brown. They stand on short stems. They ripen in winter, open soon after, and then fall off. The stem usually falls off with the pin. The cone scales are small, not thickened, rather flexible.
The seeds are very small, around 4 mm long, gray-brown. The seed wing is 10 to 15 mm long.
The wood is hard, resinous, the sapwood is very light yellow, the heartwood is a little darker.
Distribution and locations
Pinus teocote is quite widespread within Mexico. It extends from the south of Chihuahua to the south along the Sierra Madre Occidental to Chiapas . In the Sierra Madre Oriental, the species ranges from Coahuila in the north to Puebla in the south. Reports of occurrences in Guatemala are not certain.
This species grows at altitudes between 1000 and 3000 meters in very different locations. In the south it occurs on rather dry, stony or rocky slopes, in the north in rather humid locations. It copes well with frost and snow as well as high temperatures. In more open stands it often grows with other pines, such as Pinus montezumae , Pinus leiophylla , Pinus cembroides , Pinus engelmannii or Pinus patula .
Systematics
The name Pinus teocote was established by Christian Julius Wilhelm Schiede . But it was only Diederich Franz Leonhard von Schlechtendal and Adelbert von Chamisso who first correctly described the species in 1830 in the magazine "Linnaea", Volume 5, Page 76. Synonyms are Pinus patula var. Stricta Benth. ex Endl. , Pinus besseriana Roezl , Pinus hugelii Roezl ex Carriere and Pinus vilmoriniana var. Besseriana (Roezl) Carriere .
literature
- Jesse P. Perry: The Pines of Mexico and Central America. Timber Press, Portland 1991, pp. 191ff, ISBN 0-88192-174-2 .
Individual evidence
- ↑ a b Rafaël Govaerts (Ed.): Pinus. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 22, 2019.
Web links
- Description of the species on www.conifers.org
- Pinus teocote inthe IUCN 2013 Red List of Threatened Species . Posted by: Farjon, A., 2011. Retrieved November 28, 2013.