Juniperus angosturana
Juniperus angosturana is a plant belonging to the family of the cypress family ( Cupressaceae ). It is native to the mountains of Eastern Mexico.
Description
Juniperus angosturana grows (rarely to 10) than evergreen shrub or small tree, the plant height can reach 3-8 meters and diameter at breast height of up to 50 centimeters. The stem often branched soon. The brown Stammborke dissolves into square plates. The thick, sinuous branches ascending to go straight from the tree and form an irregularly shaped crown. The smooth bark of the branches turns light brown to gray with age from. She flips on young branches into small pieces and is cracked up like a mosaic on older branches.
The loosely stationary outer branches are 4-20 mm long and 1 to 1.3 millimeters thick. Their Beblätterung with scale-like leaves is limited to the last four to five branches. Are formed both cross against permanent and oblong- rhombic and overlapping scale-like leaves and run-down needle-shaped, in whorls change-constant threes standing leaves. You from 1 to 1.5 mm long and 0.7 mm wide. You are decussate or mutually threefold in whorls on the branches. The upper needle edges are finely serrated and hyaline. The visible, sunken glands are rare. You are enlarged at the needle-like leaves to 0.5 to 3 millimeters.
Juniperus angosturana is dioecious getrenntgeschlechtig ( dioecious ). The numerous, berry -like cones are made with a length of 4 to 6 mm and a thickness of 3 to 5 millimeters terminally on very short lateral branches. At first, the pins are colored green, and change color to maturity, within a period of one year purple - blue frosting. In the dried state they are brown in color. Each pin carries one or two light brown seeds. They are oval shaped to approximately spherical with a length of 3 to 5 millimeters and a width of 2.5 to 4 millimeters. They are easily grooved, tapering at the end and having at the base a navel ( hilum ). The pollen is carried out from December to January.
Distribution and location
The natural range of Juniperus angosturana located in the Sierra Madre Oriental in Mexico. There, the species occurs in the states of Coahuila, Hidalgo, Nuevo Leon, Northeast Querétaro, San Luis Potosí and Tamaulipas.
Juniperus angosturana thrives at altitudes from 1050 to 2800 meters. The species grows in open bushland and in forests, on rocky slopes and along rivers. It provides, among other things mixed stands with Juniperus flaccida, the Mexican pinyon pine ( Pinus cembroides ) and the Montezuma pine ( Pinus montezumae ).
System
The first description as Juniperus angosturana took place in 1994 by Robert Phillip Adams in Biochemical Systematics and Ecology, Volume 22, Number 7, page 704 A synonym for Juniperus angosturana RP Adams is Juniperus monosperma var gracilis Martínez.
Threats and conservation
Juniperus is angosturana " not threatened " on the Red List of IUCN. It is noted, however, that a re-evaluation of risks is required. The restriction to the small distribution area may in the future lead to danger.
Swell
- Template: Internet resource / maintenance / access date not in ISO format Christopher J. Earle: Juniperus angosturana. In: The Gymnosperm Database. www.conifers.org, May 22, accessed on 22 January 2012 ( English).