Ostrya rehderiana
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Ostrya rehderiana is a tree from the genus of the hop beech ( Ostrya ). The natural range of the species is in China . The species population is limited to a few individuals and is therefore listed as critically endangered.
description
Ostrya rehderiana is a tree up to 15 meters high with gray and rough bark . Young twigs are gray-brown, thin and hairy with silky hair. They later become bald and turn an intense reddish color. The leaves have a 3 to 5 millimeter long, densely hairy stem. The leaf blade is 3 to 10 centimeters long and 1.8 to 4 centimeters wide, oval-elongated to narrowly elongated, with a long pointed or long pointed and tailed tip, more or less rounded or broadly wedge-shaped base and irregularly double-serrated, sometimes bristly sawn leaf margin . 13 to 16 pairs of nerves are formed at a distance of 4 to 7 millimeters. The underside of the leaf along the median nerve is densely hairy, otherwise sparsely hairy, the upper side is hairy along the median nerve, otherwise bald.
Female inflorescences are loosely racemose and 2 to 3 inches long. The inflorescence axis is 1.5 to 2 inches long and densely hairy. The bracts are 2 to 2.6 inches long, 0.6 to 0.8 inches wide, obovate-elliptical or obovate-lanceolate, sac-shaped, membranous and hairy along the veins, with a rounded and pointed tip, one Base narrowing to a stem and bristly leaf margin. The nuts are red-brown, 7 to 10 millimeters long with a diameter of 2.5 to 3 millimeters, narrow-elongated, indistinctly ribbed, glabrous and shiny. Ostrya rehderiana flowers from May to June, the fruits ripen from July to August.
The number of chromosomes is 2n = 16.
Occurrence and endangerment
The natural range of the species lies in China in the northwest of the Zhejiang in the mountains Tianmu Shan . Ostrya rehderiana grows there in subtropical forests at heights of 200 to 400 meters. According to Flora of China , the population is reduced to one by the side of a road. According to the IUCN , the population is limited to five individuals in Xitianmu Shan, the western part of Tianmu Shan, and they are under protection. In the IUCN Red List , Ostrya rehderiana is therefore listed as critically endangered. It is pointed out, however, that a new check of the risk is necessary. The lack of natural regeneration of the stands is stated as the main cause of the hazard.
Systematics
Ostrya rehderiana is a species of the hop beech genus ( Ostrya ). This is in the family of birch plants of the subfamily (Betulaceae) coryloideae assigned (Coryloideae). The species was first scientifically described by Woonyong Chun in 1927 . The generic name Ostrya comes from Latin and was already used by the Romans for the hop beech. The specific epithet rehderiana refers to the German-American botanist Alfred Rehder .
proof
literature
- Wu Zheng-yi, Peter H. Raven (Ed.): Flora of China . Volume 4: Cycadaceae through Fagaceae . Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 1999, ISBN 0-915279-70-3 , pp. 300 (English).
- Helmut Genaust: Etymological dictionary of botanical plant names. 3rd, completely revised and expanded edition. Nikol, Hamburg 2005, ISBN 3-937872-16-7 (reprint from 1996).
Individual evidence
- ↑ a b c d e Pei-chun Li, Alexei K. Skvortsov: Ostrya rehderiana , in the Flora of China , Volume 4, p. 300
- ^ Ostrya rehderiana at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ Ostrya rehderiana in the endangered Red List species the IUCN 2011. Posted by: World Conservation Monitoring Center, 1998. Accessed June 3, 2012th
- ↑ Ostrya. In: Germplasm Resources Information Network (GRIN). United States Department of Agriculture, accessed June 3, 2012 .
- ↑ Exactly: Etymological Dictionary of Botanical Plant Names, pp. 446–447
Web links
- Ostrya rehderiana. In: The Plant List. Retrieved June 3, 2012 .