蜜桃av

Zelkova serrata?(Japanese zelkova,?Japanese elm,?keyaki,?or?keaki;?:?欅 (ケヤキ) keyaki /槻 (ツキ) tsuki;?:?榉树/櫸樹 jǔshù;?:????? neutinamu) is a??of the genus???to?,?, eastern??and?.?It is often grown as an?, and used in?. There are two?,?Zelkova serrata?var.?serrata?in Japan and mainland eastern Asia, and?Zelkova serrata?var.?tarokoensis?(Hayata) Li on Taiwan which differs from the type in its smaller leaves with less deeply cut serration on the margins.

Description

Zelkova serrata?is a medium-sized??tree usually growing to 30?m (98?ft) tall. It is characterized by a short trunk dividing into many upright and erect spreading stems forming a broad, round-topped head. The tree grows rapidly when young though the growth rate slows to medium upon middle age and maturity.

It has alternately arranged leaves growing to 5?cm long and broad. The leaves themselves are simple and??to oblong-ovate with serrated or crenate margins, to which the tree owes its??serrata. The leaves are??or?, rounded or??at the base, and contain 8–14 pairs of veins. The leaves are rough on top and??or nearly glabrous on the underside. They are green to dark green in spring and throughout the summer, changing to yellows, oranges and reds in autumn. The??are?2–5?mm (1?16–3?16?in) long.

Zelkova serrata?is?. It develops flowers in spring with the leaves. Buds are ovoid, acutish, with many?, dark brown scales.?They diverge at a 45 degree angle from the stem. The??flowers are shortly??and approximately 3mm in diameter, clustered in the??of the lower leaves. The??flowers are solitary or few in axils of the upper leaves,??and usually about 1.5?mm in diameter. The flowers are yellow-green, not showy, and occur in tight groups along new stems. They give rise to small, ovate, wingless??that ripen in late summer to autumn. The drupe is green maturing to brown, subsessile and?2.5 to 3.5?mm (3?32?to?1?8?in) in diameter.

To identify?Zelkova serrata, one would look for a short main trunk, low branching and a vase-shaped habit. The twigs are slender with small, dark conical buds in a zigzag pattern. The branches are usually glabrous. The bark is grayish white to grayish brown and either smooth with??or exfoliating in patches to reveal orange inner bark. The branchlets are brownish-purple to brown.

Cultivation[]

This tree requires full to partial sun and prefers moist, well-drained soils. A fertilizer rich in potassium and nitrogen encourages new vegetation and floral buds. It is adaptable and tolerant of heat, little water, nutrient-poor soils and various pH. It should be periodically thinned to allow light into the inner canopy.?Zelkova Serrata?is propagated by seeds, rooted stem cuttings and grafting. The seeds germinate without pretreatment, though the percentage is better when stratified at 5?°C (41?°F) for 60 days.?Because germination requires stratification, the seed is best sown early in the year. To ensure survival it may be necessary to pot the tree and grow it in a greenhouse for its first winter. It may be reintroduced into its permanent habitat after the final frost.[]

In Korean culture

In Korea,?Zelkova serrata?has been considered a symbol of protection for villages since ancient times, and can still be found planted at central points in cities, towns and villages around the country.?The trees often stand next to small pavilions, serving both as shaded informal gathering points, and spaces for traditional rituals and ceremonies involving prayer and offerings to the tree.?The oldest of these trees are estimated to be in excess of 1,000 years in age, and are protected as natural monuments by Korean law.?In 2013, the Korea Forest Research Institute announced a project to clone the zelkova,?, and??trees that are identified as natural monuments, so their lineage will not be lost in case of disaster or death due to age.

Threats

The threats to this tree include colder temperature, which often result in twig dieback. It is highly resistant to , which makes it a good replacement tree for American elm.?Zelkova serrata?is similar in appearance to the elms, though may be distinguished by its unwinged fruit and leaves which are symmetrical rather than uneven at their base.?Zelkova serrata?also shows good resistance to??and?.[]

The tree is prone to fungus??which was first observed in Japan on the bark of?Zelkova serrata?trees in 2003.

Cultivation and uses

Zelkova serrata?is planted as a lawn or park tree for its attractive bark, leaf color and vase shape. It provides good shade and has an easy fall cleanup. It is easy to transport, and often available in burlap form. It is also commonly used for?; its attractive shape and colors make it a popular choice for the art.?It is often grown as an?, both in its native area and in Europe and North America. The first cultivation outside of Asia was by?, who introduced it to the??in 1830.?Recently, it has been planted as a "street tree" in New York City.?In the UK it has gained the?'s?.

Numerous??have been selected, including:

It has also ?with??in Europe, the hybrid being named?.

Keyaki wood is valued in Japan and used often for furniture, such as?, as well as being considered the ideal wood for the creation of??drums.

The tree is a symbol of a number of Japanese cities and prefectures:?, Miyagi Prefecture, Fukushima Prefecture, Fukushima-shi, Abiko-shi, Tachikawa-shi, Yokohama-shi,??in?,??and more.

According to data investigated by??in 1989, the largest number of trees over 500 years old were specimens of?Zelkova serrata, among which more than ten have been registered as Natural Monuments of Korea.

Suppliers

Within the United Kingdom, the Royal Horticultural Society's Plantfinder currently lists 38 suppliers for the pure species and associated varieties.