Ostrya rehderiana
Ostrya rehderiana is a tree from the kind of hop hornbeam ( Ostrya ). The natural range of the species is in China. The population of the species is limited to a few individuals, it is therefore performed as threatened with extinction.
Description
Ostrya rehderiana is up to 15 feet tall with gray and rough bark. Young twigs are gray-brown, thin and silky hair. You verkahlen later and stain intensely reddish. The leaves have a 3 to 5 mm long, densely hairy stem. The leaf blade is 3 to 10 centimeters long and 1.8 to 4 inches wide, oval-oblong to narrowly oblong, with long pointed or long pointed and tailed peak, more or less rounded or broadly wedge -shaped base and irregular double serrated sometimes bristly serrated leaf edge. There shall be 13 to 16 pairs of nerves in the interval of 4 to 7 millimeters. The lower leaf surface along the middle nerve is densely hairy, otherwise sparsely pilose, the upper surface is hairy otherwise bald along the middle nerve.
Female inflorescences are loose racemose and 2 to 3 inches long. The inflorescence axis is hairy 1.5 to 2 inches long and dense. The outer leaves are 2 to 2.6 inches long, 0.6 to 0.8 cm wide, obovate -elliptic or obovate - lanceolate, sack -shaped, membranous and short haired along veins, with a rounded tip and bespitzter, a is narrowing to the stem base and bristly leaf edge. The nut fruits are reddish brown, 7 to 10 millimeters long, indistinctly ribbed with diameters from 2.5 to 3 millimeters, narrow -oblong, glabrous and shiny. Ostrya rehderiana flowers from May to June and the fruits ripen from July to August.
Occurrence and risk
The natural range of the species is in China to the northwest of Zhejiang Tianmu Shan mountain. Ostrya rehderiana grows in subtropical forests at altitudes of 200 to 400 meters. According to Flora of China, the stock is reduced to a copy at the side of a road. According to IUCN, the inventory on five individuals confined in Xitianmu Shan the western part of the Tianmu Shan and are under protection. In the IUCN Red List Ostrya rehderiana is therefore threatened with extinction as ( " Critically Endangered " ) out. It is noted, however, that a re-evaluation of risks is required. The main cause for the risk the lack of natural regeneration of stocks is given.
System
Ostrya rehderiana is a species in the genus of the hop hornbeam ( Ostrya ). This is in the birch family ( Betulaceae ) assigned to the subfamily of hazelnut plants ( Coryloideae ). The species was described in 1927 by Woonyong Chun first time scientifically. The genus name Ostrya is derived from Latin and was already used by the Romans for the hop hornbeam. The specific epithet refers to the rehderiana German - American botanist Alfred Rehder.