Picea linzhiensis

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Picea linzhiensis
Systematics
Family : Pine family (Pinaceae)
Subfamily : Piceoideae
Genre : Spruce trees ( Picea )
Subgenus : Casicta
Section : Sitchenses
Type : Picea linzhiensis
Scientific name
Picea linzhiensis
( WC Cheng & LK Fu ) Rushforth

Picea linzhiensis is a species fromthe pine family (Pinaceae). Keith Rushforth recognized her in 2008 as an independent species. Nevertheless, some authors consider it a variety of the Likiang spruce ( Picea likiangensis ). The species is native to southern China and further, as yet unconfirmed occurrences could also be found in northeastern India.

description

Picea linzhiensis grows as an evergreen tree that can reach heights of 30 to 50 meters and a diameter of 0.6 to 2 meters at chest height . The trunk ends in a columnar crown . The silvery gray trunk bark shows thin, brownish tears. The bark of the branches has dark brown hairs and is initially light brown or orange-brown, but turns grayish over time.

The resinous, hazelnut-brown winter buds are up to 0.9 centimeters long and have a conical-egg-shaped shape. The approximately 1 millimeter large pulvini are hairy. The needles, which are shiny green on the top, are 2 to 3 centimeters long and 0.1 to 0.15 centimeters wide. Its tip is pointed. There are two stomatal ligaments on the underside of the needle and none or, very rarely, one or two incomplete, grayish green stomatal ligaments on the upper side of the needle .

Picea linzhiensis is monoecious-segregated ( monoecious ). The cones are 5 to 12 centimeters long. They are initially slightly purple in color and turn brown until they are ripe. The thin and flexible seed scales are rounded or diamond-shaped. Their edge is jagged irregularly. The dark brown seeds are about 4 millimeters long and about 2.5 millimeters wide. They have a pale brown seed wing about 5 millimeters long and 4 millimeters wide.

The number of chromosomes is 2n = 24.

Distribution and location

The natural range of Picea linzhiensis is in southern China. It includes the Yarlung Tsangpo river in southeastern Tibet . There could be two other occurrences, which have not yet been investigated in more detail, in southwest Sichuan and in Shangri-La County in Yunnan . Another occurrence could also be found in the northern Indian state of Arunachal Pradesh .

Picea linzhiensis thrives at altitudes of 3000 to 3800 meters. It grows mainly in mountains in coniferous forests. Mixed stands are formed at lower altitudes mainly with Armand's pine ( Pinus armandii ) and, more rarely, with Pinus densata . At medium altitudes, the species forms pure stands or mixed stands with different firs ( Abies ) and with the Sikkim larch ( Larix griffithii ). From an altitude of around 3600 to 3800 meters, these forests change into pure fir forests without Picea linzhiensis . The tailed maple ( Acer caudatum ), the Sichuan birch ( Betula szechuanica ), the Himalayan birch ( Betula utilis ), the cherry apple ( Malus baccata ) and whitebeams ( Sorbus ) are often found in the undergrowth of the forests, while the shrubbery is usually made up of different types Types of magnificent bells ( Enkianthus ), spindle bushes ( Euonymus ), Fargesia , honeysuckle ( Lonicera ) and rhododendrons ( Rhododendron ) consists.

Picea linzhiensis is classified as "low endangered" in the IUCN Red List . The main hazard mentioned is logging along with the low rate of regeneration. The total population of the species is considered to be in decline. For this reason, the Chinese government has banned this type of hunt in western China.

Systematics

Picea linzhiensis is assigned to the subgenus Casicta , the section Sitchenses and the series Likiangenses within the genus of the spruce trees ( Picea ) .

It was first described as Picea likiangensis var. Linzhiensis in 1975 by Wan-Chun Cheng and Li-kuo Fu in Acta Phytotaxonomica Sinica , Volume 13 (4), pp. 83-84. Keith Rushforth raised the variety in 2008 in the International Drendrology Society Year Book 2007 , page 48 to the independent species Picea linzhiensis . Rushforth assumes that the common line of development of Picea likiangensis and Picea linzhiensis separated 3.6 to 2.6 million years ago.

swell

  • Keith Rushforth: Spruces (Picea: Pinaceae) in the Yarlung Tsangpo drainage of southeast Tibet (Xizang, China) . In: International Drendrology Society Year Book 2007 . 2008, p. 42-53 ( dendrology.org [PDF]).
  • Liguo Fu, Nan Li, Thomas S. Elias & Robert R. Mill: Pinaceae . Picea. 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 , Picea likiangensis var. Linzhiensis , p. 30 (English, Picea likiangensis var. Linzhiensis - online - this printed work is online with the same text).

Individual evidence

  1. ↑ a b c d e f Keith Rushforth: Spruces (Picea: Pinaceae) in the Yarlung Tsangpo drainage of southeast Tibet (Xizang, China) . In: International Drendrology Society Year Book 2007 . 2008, p. 42-53 ( http://www.dendrology.org/site/images/web4events/pdf/Tree%20info%20IDS_07Spruces_Picea_Pinaceae.pdf Format = PDF). Spruces (Picea: Pinaceae) in the Yarlung Tsangpo drainage of southeast Tibet (Xizang, China) ( Memento of the original from September 23, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  @1@ 2Template: Webachiv / IABot / www.dendrology.org
  2. ^ A b Liguo Fu, Nan Li, Thomas S. Elias & Robert R. Mill: Pinaceae . Picea. 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 , Picea likiangensis var. Linzhiensis , p. 30 (English, Picea likiangensis var. Linzhiensis - online - this printed work is online with the same text).
  3. ↑ a b Picea likiangensis var. Linzhiensis at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed August 1, 2016.
  4. ↑ a b c Picea linzhiensis in the endangered Red List species the IUCN 2013 Posted by: K. Rushforth, A. Farjon, 2010. Accessed November 1, 2013.
  5. ↑ Picea likiangensis var. Linzhiensis. In: The Plant List. www.theplantlist.org, accessed November 1, 2013 (English).