Abies durangensis

Abies durangensis

Abies durangensis is a coniferous tree species from the genus of fir (Abies ). The natural range is in northern Mexico.

  • 5.1 Notes and references

Description

Can Abies durangensis grows as a evergreen tree, the plant height of 20 to 40 meters and diameter at breast height of up to 150 centimeters reach. From the long straight trunk branches go from horizontal. The crown is almost conical to irregular round shape. Young trees have smooth, gray or reddish-brown bark. In older trees it is deeply furrowed and cut into oblong plates. It has a blackish brown color. The grooved, smooth or sparsely hairy Two Grinde is colored purple to reddish brown. It has round or egg-shaped leaf scars.

The oblong- egg-shaped buds are 4-5 mm long. They are surrounded by a pink - yellow resin layer. The obtuse or rounded at the tip of needles 1.4 to 4.5 centimeters long and 1 to 1.6 millimeters wide. They are colored blue green at the needle top and light green on the needle base. One finds at the needle base two white Stomatareihen.

The standing in the leaf axils male cones are 1-2 inches long. The upright, almost cylindrical cones are 5-10 cm long and 3 to 4.5 inches thick. They are on a short stalk. At maturity, they are pale yellow to medium brown. The resinous, yellow seeds is 6-8 millimeters long. Each seed has a 7-10 mm long, orange-yellow wings.

Distribution and location

The natural range of Abies durangensis located in Mexico. It extends from the north of Jalisco to the south across Sinaloa and Durango and Chihuahua and northwestern Coahuila to the north.

Abies durangensis is a tree species of the cool, damp climate. It grows at altitudes from 1600 to 2900 meters. Most well-ventilated dumps and lithosols, rare moist ravine bottoms are colonized.

There are usually mixed stands with the Mexican cypress ( Cupressus lusitanica ), the alligator juniper (Juniperus deppeana ), the Chihuahua spruce (Picea chihuahuana ), Pinus durangensis, Pinus leiophylla, Pinus strobiformis and with the Douglas Fir ( Pseudotsuga menziesii ) is formed.

System

Abies durangensis is allocated within the genus of fir (Abies ) of section Grandis. The first description was in 1942 by Maximino Martínez del instituto de Biología in Anales de la Universidad Nacional de México 13: 2 A synonym for the species is Abies neodurangensis Debreczy, Racz et Salazar.

Varieties

Abies durangensis is usually divided into two varieties:

  • Abies durangensis var coahuilensis (IM Johnst. ) Mart. occurs only in the extreme northwest Coahuila. It grows only in two river valleys. In contrast to the specific type it is usually smaller and has shorter needles. The two Grinde is also hairy denser and the needles have fewer stomata on. A synonym is Abies coahuilensis I.M. Johnst ..
  • Abies durangensis var durangensis the specific type.

Threats and conservation

Abies durangensis is listed in the IUCN Red List as " not at risk ". The var coahuilensis is classified Due to its small distribution area as " endangered". However, there is no known threat to the stock. However, it is pointed out in both varieties, that a re-evaluation of the risk is necessary.

Swell

  • Christopher J. Earle: Abies durangensis. In: The Gymnosperm Database. May 22, 2011, retrieved November 4, 2011 (English).
Chihuahua (state) Chihuahua white pine
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