Juniperus mucronata
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Juniperus mucronata is a plant from the family of the cypress family (Cupressaceae). It is native to northern Mexico.
description
Juniperus mucronata grows as an evergreen shrub or small tree that can reach heights of growth of 8 to 15 meters and a diameter of up to 50 centimeters at chest height . The branches go straight or ascending from the trunk and form a pyramidal crown that becomes wider or more irregular with age. The loose twigs are 0.8 to 1.3 millimeters thick and have a square cross-section. The smooth, red-brown or purple-colored bark turns gray over time and flakes off in small scales; thicker trunks have a cracked bark. The heartwood is mostly bright purple in color.
The scale-like, gray to yellow-green needles reach a length of 1.3 to 2 millimeters and a width of 0.7 to 1 millimeter. Their tip is prickly and the edges of the needles are entire. There are several noticeable glands on its surface, the larger ones being mostly inactive. The needles are crossed on the branches.
Juniperus mucronata is dioeciously segregated ( diocesan ). The cones ripen after one to two years. The berry-shaped cones stand on stems 3 to 6 millimeters long and are spherical to kidney-shaped with a length of 5 to 7 millimeters and a thickness of 5 to 9 millimeters. Initially they are green in color and, as they ripen, turn purple, dark blue or light brown and have a blue-green tint. Each of the fleshy cones bears one to five light brown seeds. The grooved seeds reach a length of 3 to 5 millimeters and a width of 2 to 4 millimeters. There are small resin pits at their base .
Occurrence and endangerment
The natural range of Juniperus mucronata is only in the area around Yécora and the Maicoba River near the border between the two northern Mexican states of Chihuahua and Sonora .
Juniperus mucronata thrives on the basalt slopes along the Maicoba River and neighboring rivers. It grows there about 30 to 60 meters above the water and forms mixed stands with the Mexican cypress ( Cupressus lusitanica ), the alligator juniper ( Juniperus deppeana ) and oak species ( Quercus spec.).
Juniperus mucronata is in the red list of the IUCN classified as "Vulnerable" = "vulnerable" 2011th This classification was based on the previously known, small distribution area of this species. The exact population size is not known; it is believed that there are fewer than 1,000 adult specimens.
Systematics
Robert Phillip Adams collected this species for the first time in 1998. It was first described as Juniperus mucronata in 2000 by Robert Phillip Adams in Biochemical Systematics and Ecology , Volume 28, Number 1, Page 158. Whether Juniperus mucronata is an independent species is disputed . It is also assigned to the Rocky Mountain Juniper ( Juniperus scopulorum ) or viewed as a variety Juniperus blancoi var. Mucronata (RPAdams) Farjon of Juniperus blancoi . The spatially separated distribution areas, the morphological differences and the different chemical composition of the terpenes speak for a position as a separate species . Adams also conducted RAPD studies in 2000 , which found that Juniperus blancoi and Juniperus mucronata are different from Juniperus scopulorum . At RP Adams: Junipers of the world: the genus Juniperus , 2nd edition 2008, 3rd edition 2011 and 4th edition 2014 there is more recent information.
Juniperus mucronata belongs to the Sabina section within the Juniperus .
swell
- Christopher J. Earle: Juniperus blancoi. In: The Gymnosperm Database. www.conifers.org, December 13, 2010, accessed October 7, 2012 .
Individual evidence
- ↑ a b c d e f Christopher J. Earle: Juniperus blancoi. In: The Gymnosperm Database. www.conifers.org, December 13, 2010, accessed October 7, 2012 .
- ↑ a b Juniperus mucronata in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved July 5, 2014.
- ↑ a b Juniperus blancoi var. Mucronata in the endangered Red List species the IUCN 2012. Posted by: Farjon, A. (RBG Kew), 2007. Retrieved on October 7, 2012.
- ↑ Robert Adams: Junipers of the world. Retrieved July 5, 2014 .