Pinus maximinoi
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Pinus maximinoi |
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Pinus maximinoi is a species of the pine ( Pinus )genus. Her name honors the Mexican botanist Maximino Martinez (1888–1964). This species isnativefrom Mexico to Nicaragua .
features
Pinus maximinoi is a tree that reaches heights of 20 to 35 meters, a trunk diameter of up to 100 cm and has a straight shaft. Old trees have horizontal branches that form a dense, round crown . Young trees have an open, pyramidal crown, the branches are regularly in whorls. The bark of old trees is gray-brown, rough and divided into large plates by horizontal and vertical cracks. In the upper trunk area the bark is smooth and gray-brown. In young trees, the bark is just as smooth and gray-brown. The branches are long, slender, flexible, often a little drooping.
The needle leaves stand in bundles of five short shoots ; the sheaths are permanent, pale brown and 12 to 18 mm long. The pendulous needle leaves are very slender and 15 to 28 cm long. The edge is finely sawn. There are three resin canals, rarely two to four. In some places the hypodermis extends deep into the chlorenchyma . There are two adjacent, but independent vascular bundles .
The male flowers are near the proximal end of new main shoots. They are cylindrical, 30 to 40 mm long and 5 to 8 mm wide, pinkish-brown and are surrounded by brown, subulate-lanceolate bracts .
The female cones are subterminal and elongated; the cone scales are thick and end in a small, early falling thorn. They stand in groups of 4 to 5 on a long, scaly stem. The ripe cones are red-brown, long-egg-shaped and asymmetrical. They are 5 to 8 cm long. They stand in three or four on slender, 10 to 15 mm long stems. The ripening takes place in winter; the cones open to maturity and soon afterward fall off, with the stem remaining on the cone. The cone scales are thin and flexible. The apophysis is flat and slightly transversely keeled, the umbo is small, sometimes slightly raised with a small, early sloping thorn.
The seeds are small, 5 to 7 mm long and dark brown to almost black. The seed wing is 16 to 20 mm long and light yellow-brown. The number of cotyledons is usually seven or eight (rarely six).
The wood is rather soft and soft, but firm. The sapwood is pale yellow-white, the heartwood a little darker. It is used as sawn timber, locally also as firewood and for building houses.
Occurrence
Pinus maximinoi is quite common in Mexico and Central America . It is also found in Guatemala , El Salvador , Honduras, and northern Nicaragua .
This species grows at altitudes of 600 to 2400 m, but grows best between 800 and 1500 m. The best locations are semi-tropical with well-drained soils and annual rainfall of 1000 to 2000 m. It grows together with Pinus pseudostrobus , Pinus douglasiana and other pines.
Systematics
Pinus maximinoi nom. cons. was first correctly described by Harold Emery Moore in 1966 in the magazine "Baileya" Volume 14, Page 8. Synonyms are Pinus tenuifolia Benth. 1842 nom. illeg., Pinus escandoniana Roezl , Pinus hoseriana Roezl and Pinus tzompoliana Roezl .
literature
- Jesse P. Perry: The Pines of Mexico and Central America . Timber Press, Portland 1991, pp. 118ff. ISBN 0-88192-174-2
Web links
- Pinus maximinoi inthe IUCN 2013 Red List of Threatened Species . Posted by: Farjon, A., 2011. Retrieved November 28, 2013.
Individual evidence
- ↑ Species description on conifers.org , accessed June 28, 2008.
- ↑ Rafaël Govaerts (ed.): Pinus. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 19, 2019.