Picea chihuahuana

Picea chihuahuana
Chihuahua Spruce
Picea chihuahuana growing in Guanaceví, Durango, Mexico
Conservation status
Scientific classification
Kingdom: Plantae
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Pinaceae
Genus: Picea
Species: P. chihuahuana
Binomial name
Picea chihuahuana
Mart.

Chihuahua Spruce (Picea chihuahuana) is a medium-sized evergreen tree growing to 25-35 m tall, and with a trunk diameter of up to 1 m. It is native to northwest Mexico, where it occurs in 25 small populations in the Sierra Madre Occidental mountains in Chihuahua and Durango. It grows at moderate altitudes from 2300-3200 m, growing along streamsides in mountain valleys, where moisture levels in the soil are greater than the otherwise low rainfall in the area would suggest.

The bark is thin and scaly, flaking off in small circular plates 5-10 cm across. The crown is conic, with widely spaced branches with drooping branchlets. The shoots are stout, pale buff-brown, glabrous, and with prominent pulvini. The leaves are needle-like, 17-23 mm long, stout, rhombic in cross-section, bright glaucous blue-green with conspicuous lines of stomata; the tip is viciously sharp.

The cones are pendulous, broad cylindrical, 7-12 cm long and 3 cm broad when closed, opening to 4-5 cm broad. They have stiff, bluntly rounded scales 1.5-2 cm broad, and are green, maturing pale brown 6–8 months after pollination. The seeds are black, 4 mm long, with a 10-13 mm long pale brown wing.

Chihuahua Spruce was only discovered in 1942 by the Mexican botanist Maximino Martínez, and is endangered with just 25 small populations, none comprising more than a few hundred trees. It is related to Martinez Spruce from northeast Mexico, but differs in the shorter, blue-green leaves, and the smaller, narrower cones with smaller scales. No other related spruces are found in North America, with its next-closest relatives in eastern Asia.

It is a very attractive tree and is starting to be planted as an ornamental tree in botanical gardens, particularly valued in warm areas as it is one of the most heat-tolerant of all spruces, more tolerant of summer heat than Blue Spruce, which it resembles in foliage.

References

  • Conifer Specialist Group (1998). Picea chihuahuana. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 11 May 2006. Listed as Endangered (EN B1+2e v2.3)

External links


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Picea — Saltar a navegación, búsqueda ? Abeto falso Picea abies Clasificación científica …   Wikipedia Español

  • Picea — Fichten Gemeine Fichte (Picea abies) Systematik Abteilung: Pinophyta Klasse …   Deutsch Wikipedia

  • Picea torano — Tigerschwanz Fichte Illustration der Tigerschwanz Fichte (Picea torano) Systematik Klasse: Pinopsida …   Deutsch Wikipedia

  • Chihuahua-Fichte — (Picea chihuahuana) in Guanaceví im mexikanischen Bundesstaat Durango Systematik Ordnung …   Deutsch Wikipedia

  • Fichten — Gemeine Fichte (Picea abies) Systematik Unterabteilung: Samenpflanzen (Spermatophytina) Klasse …   Deutsch Wikipedia

  • Ель — У этого термина существуют и другие значения, см. Ель (значения). Не следует путать с Ёль. Ель …   Википедия

  • Spruce — For other uses, see Spruce (disambiguation). Spruce Norway Spruce (Picea abies) Scientific classification Kingdom …   Wikipedia

  • Ели — ? Ель Ель обыкновенная Молодое дерево. Юг Германии Научная классификация Царство: Растения Отдел: Хвойные …   Википедия

  • Елка — ? Ель Ель обыкновенная Молодое дерево. Юг Германии Научная классификация Царство: Растения Отдел: Хвойные …   Википедия

  • Tigerschwanz-Fichte — Illustration der Tigerschwanz Fichte (Picea torano) Systematik Klasse: Coniferopsida Ordnung …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”