Ostryopsis
| Ostryopsis | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Tall beech ( Ostryopsis davidiana ) |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Ostryopsis | ||||||||||||
| Decne. |
Ostryopsis is a genus of plants in the birch family (Betulaceae). They also have the common German name Scheinhopfenbuchen . The three species of the genus occur only in China.
description
Appearance and leaves
Ostryopsis species are deciduous shrubs . The alternate arranged on the branches leaves are stalked. The single leaf blade is usually irregular and doubly serrate or incised.
Inflorescences, flowers and fruits
Ostryopsis species are single sexed ( monoecious ). The male inflorescences are lateral or terminal, only short-stalked, spiky-zymose, cylindrical catkins that are protected by buds in winter. They have many overlapping bracts , through each of which a flower is, but no bracts (Brakteolen). The male flowers contain four to eight stamens and, as is common in wind-pollinated taxa , there are no bracts . The dust bags consist of two overgrown counters. The female inflorescences are lateral or terminal and racemose-head-shaped. They contain a bundle of a few flowers and have leathery bracts that form a tube with a lobed upper end around two flowers. The female flowers have calyx leaves that are fused with the ovary.
The egg-shaped, spherical nuts have raised ribs, are wingless and completely covered by bracts. The two cotyledons ( cotyledons ) are thick and fleshy.
Chromosome number
The number of chromosomes is 2n = 16.
Systematics and distribution
The genus Ostryopsis occurs only in northern China.
The first description of the genus ostryopsis in 1873 from Joseph Decaisne in Bulletin de la Société Botanique de France , vol 20, p 155. The type species is ostryopsis davidiana Decne. The genus Ostryopsis Decne. belongs to the subfamily Coryloideae in the family Betulaceae . It used to be placed in the Carpinaceae or Corylaceae families.
Only three species belong to the genus Ostryopsis :
- Tall pseudo-hop beech ( Ostryopsis davidiana Decne. ): It thrives in light forests and in bushes at altitudes between 800 and 2800 meters in Gansu , Hebei , Liaoning , Nei Mongol , Ningxia , Shaanxi , Shanxi and in western Sichuan . It is used to regulate soil erosion. Agricultural implements are made from their branches.
- Ostryopsis intermedia B.Tian & JQLiu : It was only described in 2010 in Botanical Studies , Volume 51, p. 261, Figure 1. It occurs only at altitudes between 1500 and 2500 meters in northwestern Yunnan .
- Ostryopsis nobilis Balf. f. & WWSm. : It thrives in bushes on sunny mountain slopes at altitudes between 1500 and 3000 meters in southwest Sichuan and northwest Yunnan.
swell
- Pei-chun Li Alexei K. Skvortsov: Betulaceae : ostryopsis , pp 289 - online text same as printed work , In: Wu Zheng-yi & Peter H. Raven (Editor): Flora of China , Volume 4 - Cycadaceae through Fagaceae , Science Press and Missouri Botanical Garden Press, Beijing and St. Louis, 1999. ISBN 0-915279-70-3 (Section Description, Systematics, Distribution and Use)
Individual evidence
- ↑ a b Walter Erhardt among others: The great pikeperch. Encyclopedia of Plant Names . Volume 2. Verlag Eugen Ulmer, Stuttgart 2008. ISBN 978-3-8001-5406-7
- ↑ a b First description of Ostryopsis intermedia (PDF)
- ^ First description of Ostryopsis scanned at biodiversitylibrary.org .
- ↑ Entry in Tropicos .
- ^ Ostryopsis in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland.
