Juniperus standleyi
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Juniperus standleyi |
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| Steyerm. |
Juniperus standleyi is a plant from the family of the cypress family (Cupressaceae). It is native to southern Mexico and Guatemala.
description
Juniperus standleyi grows as an evergreen , prostrate or upright shrub or tree that can reach heights of up to 20 meters. The branches go straight or ascending from the trunk. The numerous short branches are arranged close to the branches and have a square cross-section. The reddish brown bark becomes dark brown, rough and scales with age.
The light green to blue-green, arched leaves are 1.5 to 1.7 millimeters long and 0.7 to 1.1 millimeters wide and are egg-shaped to diamond-shaped and are opposite to each other on the branches. The more or less translucent leaf margins are usually entire and only sometimes jagged irregularly. The tip of the leaf is usually blunt and tapering only on the longer leaves of the shoots. The inconspicuous and inactive leaf glands are located centrally on the underside of the leaf.
Juniperus standleyi is dioecious-separated sex ( diocesan ). The male cones are 2 to 3 millimeters long and 1.5 to 1.8 millimeters thick. They contain six to ten shield-shaped microsporophylls , which carry three to four sporangia . The female berry cones are approximately spherical in shape with a diameter of 5 to 9 millimeters. When they ripen in the same year, they are purple-brown to brown in color and often have blue-green frosting. Each of the resinous cones bears two to four brown seeds. The seeds are egg-shaped with a length of 2.3 to 3.5 millimeters and a width of 2.0 to 2.5 millimeters and have resin pits and furrows filled with yellow resin.
Distribution and location
The natural range of Juniperus standleyi includes the mountainous regions of Guatemala and Chiapas , a state in southern Mexico.
Juniperus standleyi thrives at altitudes of 3100 to 4060 meters. There it grows mainly on soils that are formed on limestone. Above all rocky slopes, the edges of table mountains and rubble heaps are populated. The species can also gain a foothold in agricultural areas. At higher locations it comes to stand formation with Pinus hartwegii .
use
The wood from Juniperus standleyi is used as firewood and construction wood.
Systematics
It was first described as Juniperus standleyi in 1943 by Julian Alfred Steyermark in Publications of the Field Museum of Natural History, Botanical Series , Volume 23 (1), page 3.
Hazard and protection
Juniperus standleyi is classified as "Critically Endangered" on the IUCN Red List . It is pointed out, however, that a new review of the hazard is necessary. Heavy logging is cited as the main risk. The species is only found in less than a third of the originally 700 km² distribution area.
swell
- Christopher J. Earle: Juniperus standleyi. In: The Gymnosperm Database. www.conifers.org, November 23, 2012, accessed January 3, 2013 .
- A. Farjon: Cupressaceae . Juniperus. In: Flora Mesoamericana . Volume 2, No. 1 , 1999, Juniperus standleyi , p. 6–7 (English, Juniperus standleyi - Online [PDF; 29 kB ] this printed work is online with the same text).
Individual evidence
- ↑ a b c d A. Farjon: Cupressaceae . Juniperus. In: Flora Mesoamericana . Volume 2, No. 1 , 1999, Juniperus standleyi , p. 6–7 (English, Juniperus standleyi - Online [PDF; 29 kB ] this printed work is online with the same text).
- ↑ Christopher J. Earle: Juniperus standleyi. In: The Gymnosperm Database. www.conifers.org, November 23, 2012, accessed January 3, 2013 .
- ↑ a b Juniperus standleyi in the endangered Red List species the IUCN 2012. Posted by: Conifer Specialist Group, 2000. Retrieved on January 3, 2013.
- ↑ Juniperus standleyi at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed January 3, 2013.