Juniperus microsperma

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Juniperus microsperma
Systematics
Order : Conifers (Coniferales)
Family : Cypress family (Cupressaceae)
Subfamily : Cupressoideae
Genre : Juniper ( Juniperus )
Section : Sabina
Type : Juniperus microsperma
Scientific name
Juniperus microsperma
( WCCheng & LKFu ) RPAdams

Juniperus microsperma is a plant from the family of the cypress family (Cupressaceae). It is native to China. Some authors consider the species to be a variety of Mekong juniper ( Juniperus convallium ), but chemical studies support the species status.

description

Juniperus microsperma grows as an evergreen tree , rarely also as a shrub . The dense, straight or curved branches branch off from the branches. These are up to 1 millimeter thick and are usually pencil-shaped in cross-section, rarely rectangular in shape.

There are two different leaf shapes . The gray-green, scale-like leaves reach a length of 1.5 to 2 millimeters and a width of 0.8 to 1 millimeter. They are curved either inwards or outwards and have an elliptical or ovoid resin gland near the base on the underside of the needle. They are cross-opposite or rarely in three whorls on the branches. The also gray-green, needle-shaped leaves are only found on young trees where they are cross-opposite or in whorls of three on the branches. They reach a length of 3 to 8 millimeters and are curved inwards on the top of the needle.

Juniperus microsperma can be both dioecious and separate sexes ( dioecious ) and monoecious ( monoecious ). The male cones have a diameter of 1.5 to 3 millimeters. They contain six to eight microsporophylls with two to three pollen sacs . The short stalked berry cones are egg-shaped to conical-egg-shaped or spherical with a length of 5 to 7 millimeters and a diameter of about 5 millimeters. As they ripen, they are reddish brown to purple-black in color and can have a blue-green tint. Each of the cones bears a seed. The flattened seeds are egg-shaped with a length of about 4 millimeters and a width of about 3 millimeters and may have a resin pit.

Distribution and location

The natural range of Juniperus microsperma is in China. It includes the east of the Tibet Autonomous Region and the west of the Sichuan Province .

Juniperus microsperma thrives at altitudes of 3180 to 4000 meters.

Systematics

It was first described as Sabina convallium var. Microsperma in 1975 by Wan Chun Cheng and Li Kuo Fu in Acta Phytotaxonomica Sinica , Volume 13 (4), page 86. In 2000, the variety was published by Robert Phillip Adams after chemical studies of the terpenes in Biochemical Systematics and Ecology Volume 28, Page 850 raised to species status as Juniperus microsperma . Other synonyms for Juniperus microsperma (WCCheng & LKFu) RPAdams are Juniperus convallium var. Microsperma (WCCheng & LKFu) Silba and Sabina microsperma (WCCheng & LKFu) WCCheng & LKFu .

Hazard and protection

Juniperus microsperma is in the red list of the IUCN classified Due to the insufficient data available in any danger category. It is assumed that due to difficulties in identifying the species, the exact range of the species is not yet known.

swell

  • 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 convallium var. Microsperma , pp. 75 (English, Juniperus convallium var. Microsperma - online - this printed work is online with the same text).

Individual evidence

  1. ↑ Rafaël Govaerts (ed.): Juniperus. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved March 29, 2019.
  2. ^ A b c 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 convallium , pp. 75 (English, Juniperus convallium - online - this printed work is online with the same text).
  3. ↑ a b c d 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 convallium var. Microsperma , pp. 75 (English, Juniperus convallium var. Microsperma - online - this printed work is online with the same text).
  4. ↑ Juniperus microsperma. In: Germplasm Resources Information Network. www.ars-grin.gov, accessed on August 25, 2012 (English).
  5. ↑ a b c Juniperus convallium . Var microsperma in the Red List of Threatened Species of the IUCN 2012. Posted by: Farjon, A. (RBG Kew), 2007. Retrieved on 25 August 2012.
  6. ↑ Juniperus microsperma at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed August 25, 2012.