Zelkova

Japanese zelkova ( Zelkova serrata )

The zelkova ( Zelkova ) are a genus of flowering plants in the family of Elm Family ( Ulmaceae ). They are endangered by Dutch elm disease.

Description

Zelkova species are deciduous trees or shrubs. The zelkova have a ring-porous, hard heartwood. The alternate and distichous arranged leaves are divided into petiole and leaf blade. The simple leaf blade has a notched or serrated edge easily and unlike the elms the Spreitenbasis is symmetrical.

The Zelkova species are monoecious getrenntgeschlechtig ( monoecious ). The flowers are inconspicuous in clusters in the leaf axils. The female flowers are located at the top, the male at the base of this year's branches.

The short -stalked drupe is asymmetric and wingless.

Dissemination

The present main distribution area of the genus Zelkova is Southwest and East Asia. In China, there are three types, two of them only there. In the Tertiary the genus Zelkova also grew in Europe. The endemics Zelkova abelicea in the mountains of Crete and Zelkova sicula from Sicily represent relict deposits from this period dar.

Three species are on the Red List of endangered species in the IUCN.

System

The genus Zelkova was first published in 1841 by Édouard Spach. Type species is Zelkova crenata Spach, now a synonym of Zelkova carpinifolia ( Pallas ) K.Koch. The genus name Zelkova is from the Georgian local name " Dselkua " or " Dselkwa " (Georgian ძელქვა ) borrowed for this tree. A synonym for Zelkova is Abelicea Baill.

In the genus Zelkova there are six types:

• Cretan zelkova ( Zelkova abelicea ( Lam.) Boiss, Syn. Zelkova cretica ( Spach ) Spach ): This endemic species is found only in the higher mountains of Crete. It is in the Red List of endangered species in the IUCN since 2011 as "endangered " = " high risk " rating.
• Caucasian Zelkova ( Zelkova carpinifolia ( Pallas ) K.Koch, Syn: Zelkova crenata Spach, Zelkova ulmoides ( Kuntze ) CKSchneid. ): The range extends from eastern Anatolia via the Caucasus to northern Iran. It is on the Red List of Threatened Species IUCN = since 1998 as " Lower Risk / near threatened " classified as "low risk".
• Zelkova schneideriana Hand. - Mazz. Thrives along rivers mostly at altitudes 200-1100 meters ( 1800-2800 feet in Xizang and Yunnan ) in the Chinese provinces of Anhui, Fujian, southern Gansu, Guangdong, Guangxi, Guizhou, southern Henan, Hubei, Hunan, Jiangsu, Jiangxi, southern Shaanxi, southeastern Sichuan, southeastern Xizang, Yunnan and Zhejiang.
• Japanese zelkova ( Zelkova serrata ( Thunb. ) Makino, Syn: Zelkova acuminata Planch, Zelkova hirta CKSchneid, Zelkova keaki Maxim. .. ): It occurs in Korea, Japan, Taiwan, the Kuril Islands and eastern China.
• Zelkova sicula Di Pasq, Garfi & Quézel. Endemic This comes with only two small populations in the Iblei ago in eastern Sicily. It is on the Red List of Threatened Species IUCN = since 1997 and most recently in 2006 as " critically endangered ", " threatened with extinction " rated.
• Zelkova sinica CKSchneid. Thrives in valleys and along rivers at altitudes 800-2500 m in the Chinese provinces of Gansu, Hebei, Henan, northwestern Hubei, Shaanxi, southern Shanxi and northern Sichuan.

Hybrids:

• Zelkova × verschaffeltii ( Dippel ) G.Nicholson: It was built before 1885 in culture from Zelkova Zelkova serrata × carpinifolia in the nursery van Houtte in Ghent, Belgium.

Use

The use is similar to the wood of the elm. Zelkova serrata, Z. sinica, cultivated Z. and Z. carpinifolia be abelicea as bonsai.