Abies vejarii

Abies vejarii is a coniferous tree species from the genus of fir (Abies ). It occurs in two isolated herds in northern Mexico.

  • 5.1 Notes and references

Description

Can Abies vejarii grows as a evergreen tree, the growth heights of up to 40 meters and diameter at breast height of up to 1.5 meters reach. The branches go horizontally from the trunk, and form a broad - conical to pyramidal crown. Young trees have smooth gray bark which is colored gray-brown with age, roughening and scaly tears. The bark of the branches is first purple, orange brown colored later. It is hairless, smooth and has a shallow furrowing on.

The spherical buds are very resinous and are about 2.5 millimeters long and 3 millimeters thick. They consist of keeled bud scales. The needles are 1 to 2.5 inches long and 1.3 to 2 millimeters wide. They are twisted at the base and are arranged spirally on the twigs. At the needle bottom you will find two broad, whitish colored Stomatabänder.

The spherical male cones are reddish in color and are approximately 5 millimeters in size. Your tip is blunt. They stand in groups on the branches. The upright, oblong- ovoid cones are 6-12 cm long and 4-6 inches thick. Immature cones are dark purple and dark brown colored mature. The seeds are 8-10 mm long and have a 15 mm long and about 12 mm wide, purple brown wings.

Distribution and location

The natural range of Abies vejarii comprises two mutually isolated stocks in the Sierra Madre Oriental in the north of Mexico. These stocks are in Southeast Coahuila and Nuevo León, and Tamaulipas in West.

Abies vejarii is a tree species of cool climate with dry summers and wet winters. They are found at altitudes 2000-3300 meters.

There are mainly formed mixed stands with different oak and pine species as well as the Douglas Fir ( Pseudotsuga menziesii).

System

Abies is vejarii assigned religiosae within the genus of fir (Abies ) of section Oiamel and the lower section. The first description was in 1942 by Maximino Martínez in Anales del Instituto de Biología de la Universidad Nacional Autonoma de México, Series Biology 13 (2): 629

Subspecies and varieties

Abies vejarii is usually divided into two sub- species and two varieties:

  • Abies vejarii subsp. mexicana ( Martinez ) Farjon occurs in the Sierra de Santa Caterina, which forms the border between the two states of Coahuila and Nuevo Leon. They can be found there at altitudes of 2000 to 3000 meters. A synonym is Abies mexicana Martínez.
  • Abies vejarii subsp. vejarii is the specific type Abies vejarii subsp. vejarii macrocarpa var Martínez
  • Abies vejarii subsp. vejarii var vejarii comes to the Mesa de las Tablas ago in Coahuila and to the Cerro Potosí, Nuevo León.

Threats and conservation

Abies is vejarii " not threatened " on the Red List of IUCN. The subspecies mexicana is on the Red List as "vulnerable" out. The main hazard reason applies her small distribution area. It is noted, however, that both entries includes a re-evaluation of risks is required.

Swell

  • Template: Internet resource / maintenance / access date not in ISO format Christopher J. Earle: Abies vejarii. In: The Gymnosperm Database. www.conifers.org, accessed on 28 March 2011 (English).
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