Tibet juniper
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The Tibet juniper ( Juniperus tibetica ) is a plant from the family of the cypress family (Cupressaceae). It is native to China.
description
As an evergreen tree, the Tibetan juniper rarely also grows as a shrub that can reach heights of up to 30 meters. The twigs are close or loosely arranged on the branches and have a round to square cross-section.
Two forms of leaves are formed. The needle-shaped leaves are found on seedlings and young trees. They are 4 to 8 millimeters long and stand together in three whorls . With a length of 1 to 3 millimeters, the scale leaves are egg-shaped to diamond-shaped and are cross-opposite, sometimes in three whorls on the branches. Its tip is blunt and in the middle of the underside of the leaf there is a conspicuous, linear-elliptical to linearly shaped leaf gland .
The Tibetan juniper is single-sexed ( monoecious ), rarely also dioecious ( dioecious ). The male cones are approximately spherical in shape with a diameter of about 2 millimeters. They contain six to eight microsporophylls which each carry two to three pollen sacs . The upright, female berry cones are egg-shaped to approximately spherical with a length of 0.9 to 1.6 centimeters and a thickness of 0.7 to 1.3 centimeters. When ripe they are colored brown or black to purple-black. Each peg bears a seed. The seeds are egg-shaped with a length of 7 to 11 millimeters and a width of 6 to 8 millimeters, rarely also obovate or spherical and have resin pits.
Distribution and location
The natural range of the Tibetan juniper is in China. It includes the south of Gansu , the south of Qinghai , Sichuan and the east and south of the Tibet Autonomous Region .
The Tibetan juniper thrives at altitudes of 2700 to 4800 meters. It occurs mainly in forests that grow on mountain slopes and in mountain valleys.
use
The wood of the Tibetan juniper is used.
Systematics
The first description as Juniperus tibetica was made in 1924 by Vladimir Leontyevich Komarov in Botanicheskie Materialy Gerbariya Glavnogo Botanicheskogo Sada RSFSR , volume 5, page 27. synonyms for Juniperus tibetica Kom. Are Juniperus distans Florin , Juniperus potaninii Kom. , Juniperus zaidamensis Kom. And Sabina tibetica ( Com.) WC Cheng & LK Fu .
Hazard and protection
The Tibet Juniper is classified as "not endangered" in the IUCN Red List . It is pointed out, however, that a new review of the hazard is necessary.
swell
- Christopher J. Earle: Juniperus tibetica. In: The Gymnosperm Database. www.conifers.org, November 27, 2012, accessed January 3, 2013 .
- Liguo Fu, Yong-fu Yu, Robert P. Adams & Aljos Farjon: Cupressaceae . Juniperus. In: Wu Zhengyi, Peter H. Raven & Hong Deyuan (eds.): Flora of China . Cycadaceae through Fagaceae. Volume 4. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 1999, ISBN 0-915279-70-3 , Juniperus tibetica , pp. 76 (English, Juniperus tibetica - online - this printed work is online with the same text).
Individual evidence
- ↑ a b c d e f Liguo Fu, Yong-fu Yu, Robert P. Adams & Aljos Farjon: Cupressaceae . Juniperus. In: Wu Zhengyi, Peter H. Raven & Hong Deyuan (eds.): Flora of China . Cycadaceae through Fagaceae. Volume 4. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 1999, ISBN 0-915279-70-3 , Juniperus tibetica , pp. 76 (English, Juniperus tibetica - online - this printed work is online with the same text).
- ↑ Juniperus tibetica. In: Germplasm Resources Information Network. www.ars-grin.gov, accessed on January 3, 2013 (English).
- ↑ Juniperus tibetica at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed January 3, 2013.
- ↑ Juniperus tibetica in the endangered Red List species the IUCN 2012. Posted by: Conifer Specialist Group, 1998. Retrieved on January 3, 2013.