Juniperus blancoi
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| Juniperus blancoi | ||||||||||||
| Martínez |
Juniperus Blancoi is a plant from the family of the cypress family (Cupressaceae). It isnativeto Mexico .
description
Juniperus blancoi grows as an evergreen shrub or small tree that can reach heights 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 bark turns gray over time and flakes off in small scales. Thicker trunks have a cracked bark. The heartwood is colored light purple to purple brown.
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 point is blunt or tapered to a point and the edges of the needle are entire. There are several noticeable glands on its surface, the larger ones being mostly inactive. The needles are crossed on the branches.
Juniperus blancoi is dioecious-segregated ( diocese ) and 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 .
Distribution and location
The natural range of Juniperus blancoi is in Mexico. It includes the states of Chihuahua , Durango , México , Michoacán , Sonora and Tlaxcala .
Juniperus blancoi thrives at altitudes of 1100 to 3270 meters. The species is found mainly in dry pinyon-pine forests as well as in pine - oak - juniper mixed forests growing along river beds . It grows on rock as well as on thin soils that formed on basalt . Especially var. Mucronata forms mixed stands with the Mexican cypress ( Cupressus lusitanica ), the alligator juniper ( Juniperus deppeana ) and with various oaks ( Quercus ).
Systematics
It was first described as Juniperus blancoi in 1946 by Maximino Martínez in "Anales del Institutó de Biología de la Universidad Nacional Autonoma de México, Série Biologia", Volume 17, Number 1, Page 73.
The species is divided into up to three varieties :
- Juniperus blancoi var. Blancoi is the nominate form and occurs in almost the entire range.
- Juniperus Blancoi var. Huehuentensis R.P.Adams, S. González & M.González comes only in the summit region of the south of Huachichiles nearby Cerro Huehuento before in the state of Durango. It only grows as a shrub.
- Juniperus blancoi var. Mucronata (RP Adams) Farjon occurs along the course of the Maicoba River and the neighboring rivers on the border between Sonora and Chihuahua. Their needles are blunt and the heartwood is bright purple in color. It is considered by some authors as an independent species Juniperus mucronata R.P. Adams viewed.
Hazard and protection
Juniperus blancoi is listed as "endangered" on the IUCN Red List . It is pointed out, however, that a new check of the risk is necessary. The mucronata variety is also listed as "endangered". It is believed that there are fewer than 1,000 fully grown trees of this variety.
swell
- Christopher J. Earle: Juniperus blancoi. In: The Gymnosperm Database. www.conifers.org, December 13, 2010, accessed February 12, 2012 .
Individual evidence
- ↑ a b c d e f g Christopher J. Earle: Juniperus blancoi. In: The Gymnosperm Database. www.conifers.org, December 13, 2010, accessed February 12, 2012 .
- ↑ a b c Juniperus blancoi at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed February 12, 2012.
- ↑ Juniperus blancoi in the endangered Red List species the IUCN 2011. Posted by: Conifer Specialist Group, 1998. Retrieved on February 12 2012th
- ↑ Juniperus blancoi var. Mucronata in the endangered Red List species the IUCN 2011. Posted by: Farjon, A. (RBG Kew), 2007. Accessed 16 February 2012.