Juniperus standleyi
Juniperus standleyi is a plant belonging to the family of the cypress family ( Cupressaceae ). It is native to southern Mexico and Guatemala.
Description
Juniperus standleyi grows as evergreen, low- lying or upright shrub or tree that can reach heights of growth of up to 20 meters. The branches go straight or ascending from the trunk. The numerous short branches are densely arranged on the branches and have a square cross-section. The reddish -brown bark is dark brown with age, rough and forms scales from.
The light green to blue- green, curved leaves are oval to rhomboid shaped with a length of 1.5 to 1.7 millimeters and a width of 0.7 to 1.1 millimeters and are decussate on the branches. The more or less translucent leaf margins are usually entire, and only sometimes jagged irregular. The blade tip is usually blunt and only on the longer leaves of the shoots pointed. The inconspicuous and inactive leaf glands are located centrally on the underside of leaves.
Juniperus standleyi is dioecious - getrenntgeschlechtig ( dioecious ). The male cones are 2-3 mm long and 1.5 to 1.8 millimeters thick. They have six to ten peltate Mikrosporophylle bearing three to four sporangia. Beer female cones are approximately spherical shape with a diameter of 5 to 9 mm. To maturity in the same year they are pupurbraun to brown in color and often frosted blue-green. Each of the resinous pin carries two to four brown seeds. The seeds are broad ovoid shaped with a length of 2.3 to 3.5 millimeters and a width of 2.0 to 2.5 mm and have resin pits, filled with yellow resin furrows on.
Distribution and location
The natural range of Juniperus standleyi includes the mountainous regions of Guatemala and Chiapas, one located in the southern Mexico state.
Juniperus standleyi thrives at altitudes 3100-4060 meters. Where it grows mainly on soils that form on limestone. There are colonized mainly rocky slopes, the edges of mesas and scree. In agricultural areas, the way to gain a foothold. At higher elevation sites it comes to stock form with Pinus hartwegii.
Use
The wood of Juniperus standleyi is used as fuel and construction wood.
System
The first description as Juniperus standleyi took place in 1943 by Julian Alfred Steyermark in Publications of the Field Museum of Natural History, Botanical Series, Volume 23 (1 ), page 3
Threats and conservation
Juniperus standleyi is classified as " critically endangered " in the IUCN Red List. It is noted, however, that a re-examination of risk is necessary. The main hazard due to the strong felling is called. One finds the only way more in less than a third of the original 700 -acre area of distribution.
Swell
- Christopher J. Earle: Juniperus standleyi. In: The Gymnosperm Database. www.conifers.org, November 23, 2012, accessed January 3, 2013 ( English).
- A. Farjon: Cupressaceae. Juniperus. In: Flora Mesoamericana. Volume 2, No. 1, 1999, Juniperus standleyi, pp. 6-7 ( this printed work is the same text online, Juniperus standleyi - Online (PDF, 29 kB) ).