Picea chihuahuana

Chihuahua spruce (Picea chihuahuana ) Guanacevi in Durango State, Mexico

The Chihuahua spruce (Picea chihuahuana ) is a flowering plant in the genus of spruce (Picea ). It was only discovered in 1942 by Rigoberto Dueñas and identified and described by the Mexican botanist Maximino Martínez.

Description

The Chihuahua spruce is reached 45-99 cm, a medium-sized evergreen tree, the plant height of 25 to 40 meters and a trunk diameter ( DBH = diameter at breast height ). The thickness growth culminates at an age of about 85 years. Through his native Mexico due to the Chihuahua spruce is very heat tolerant. The light - gray bark is thin and scaly and peeling in small circular plates 5-10 cm diameter from. The narrow conical tree crown is just around the growing base of around a few long branches between many very short branches. The blue- blue-green, extremely sharp needles have a length of 17-23 mm, a rhombic to slightly flattened cross-section and flashy Stomatalinien.

The hanging female cones are 7-12 cm long and cylindrical. You are only green and when ripe orange - brown, closed with a diameter of 3 cm and 4.5 cm open. The cones mature 6-8 months after pollination. The black, 3.5 to 4 mm long seeds have a 10 to 12 mm long wings. The thousand grain weight is 3.56 g

The Chihuahua spruce, in comparison with other spruce species a high tolerance to high calcium concentrations.

Occurrence

The home of Chihuahua spruce is located in northwestern Mexico in the Sierra Madre Occidental in Chihuahua and Durango. There it occurs in 25 small populations, each containing few to a few hundred copies. It grows at altitudes 2300-3200 meters on river banks in mountain valleys on fresh to moist sites.

Picea chihuahuana as Reliktendemit is considered endangered ( Endangered (IUCN 2.3) ) for inclusion in the Red List of endangered species in the IUCN.

Swell

• Template: Internet resource / maintenance / access date not in ISO format Christopher J. Earle, Michael P. Frankis: Picea chihuahuana. In: The Gymnosperm Database. Retrieved on 15 December 2010.
• Alan G. Gordon: Ecology of Picea chihuahuana Martinez. In: Ecology. Volume 49, No. 5, 1968, ISSN 0012-9658, pp. 880-896.