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Overview

Distribution

Localities documented in Tropicos sources

Zelkova serrata (Thunb.) Makino:
Japan (Asia)
Russian Federation (Asia)
South Korea (Asia)
China (Asia)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Anhui, Fujian, Gansu (Qin Ling), N Guangdong, Guizhou, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Liaoning (Dalian), Shaanxi (Qin Ling), Shandong, Sichuan, Taiwan, Zhejiang [Japan, Korea, Russia (Kuril Islands)].
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National Distribution

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Trees, to 30 m tall, d.b.h. to 1 m, deciduous. Bark grayish white to grayish brown, exfoliating. Branchlets brownish purple to brown, pubescent or glabrescent. Winter buds conic-ovoid to ovoid. Stipules brownish purple, lanceolate, 7-9 mm. Petiole 2-6 mm, pubescent; leaf blade elliptic to ovate-lanceolate, 3-10 × 1.5-5 cm, papery to thickly papery, glabrous or abaxially sparsely pubescent along veins, adaxially sparsely hispid, base slightly oblique, rounded, or shallowly cordate, margin serrate to crenate, apex caudate-acuminate; secondary veins 9-15 on each side of midvein. Male flowers: shortly pedicellate, ca. 3 mm in diam. Perianth (5 or)7(or 8)-parted to middle. Female flowers: subsessile, ca. 1.5 mm in diam. Perianth 4- or 5(or 6)-parted. Ovary pubescent. Drupes pea green, subsessile, 2.5-3.5 mm in diam., surface covered by an irregular network of low ridges. Fl. Apr, fr. Sep-Nov. 2n = 28.
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Diagnostic Description

Synonym

Abelicea hirta C. K. Schneider; Corchorus serrata Thunberg; Planera acuminata Lindley; P. japonica Miquel; Ulmus keaki Siebold; Zelkova acuminata Planchon; Z. formosana Hayata; Z. hirta C. K. Schneider; Z. keaki Maximowicz; Z. serrata (Thunberg) Makino var. tarokoensis (Hayata) Li; Z. tarokoensis Hayata.
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Ecology

Habitat

Valleys, beside streams; 500-2000 m.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Zelkova serrata

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Zelkova serrata

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 19
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNA - Not Applicable

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

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Wikipedia

Zelkova serrata

Zelkova serrata (keyaki or Japanese zelkova; Japanese: 欅 (ケヤキ) keyaki; Chinese: 榉树/櫸樹 jǔshù; Korean: 느티나무 neutinamu) is a species of flowering plant native to Japan, Korea, eastern China and Taiwan.[2][3] It is often grown as an ornamental tree, and used in bonsai.

Description[edit]

Foliage and flowers in spring
Bark of mature Japanese zelkova

Zelkova serrata is a medium-sized deciduous 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.[4]

It has alternately arranged leaves growing to 5 cm long and broad. The leaves themselves are simple and ovate to oblong-ovate with serrated or crenate margins, to which the tree owes its specific epithet serrata. The leaves are acuminate or apiculate, rounded or subcordate at the base, and contain 8-14 pairs of veins. The leaves are rough on top and glabrous 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 petioles are 2–5 mm long.[5]

Z. serrata develops monoecious flowers in spring with the leaves. Buds are ovoid, acutish, with many imbricate, dark brown scales.[4] They diverge at a 45 degree angle from the stem. The staminate flowers are shortly pedicellate and approximately 3mm in diameter, clustered in the axils of the lower leaves. The pistillate flowers are solitary or few in axils of the upper leaves, sessile 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 drupes that ripen in late summer to autumn. The drupe is green maturing to brown, subsessile and 2.5 to 3.5 mm 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 lenticels or exfoliating in patches to reveal orange inner bark. The branchlets are brownish-purple to brown.

Environmental needs[edit]

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 41 degrees F for 60 days.[4] 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.

Threats[edit]

The threats to this tree include colder temperature, which often result in twig dieback. It is highly resistant to Dutch elm disease, 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.[6] Zelkova serrata also shows good resistance to elm leaf beetle and Japanese beetle.

Variants[edit]

There are two varieties, Zelkova serrata var. serrata in Japan and mainland eastern Asia, and Zelkova serrata var. tarokoensis (Hayata) Li on Taiwan; the latter differs from the type in its smaller leaves with less deeply cut serration on the margins.[3]

Cultivation and uses[edit]

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 bonsai; its attractive shape and colors make it a popular choice for the art.[2][3]It is often grown as an ornamental tree, both in its native area and in Europe and North America. The first cultivation outside of Asia was by Philipp Franz von Siebold, who introduced it to the Netherlands in 1830.[3] Recently, it has been planted as a "street tree" in New York City.[7] It has gained the Royal Horticultural Society's Award of Garden Merit.[8]

Numerous cultivars have been selected, including

  • 'Fuiri Keaki' (variegated leaves)
  • 'Goblin' (dwarf)
  • 'Goshiki' (variegated leaves)
  • 'Green Vase' (tall, narrow crown[9])
  • 'Green Veil' (pendulous branchlets)
  • 'Iruma Sango' (fastigiate)
  • 'Nire Keaki' (semi-dwarf)
  • 'Pulverulenta' (variegated leaves)
  • 'Spring Grove' (upright crown)
  • 'Variegata' (variegated leaves)
  • 'Village Green' (grows more rapidly than ordinary seedlings and develops a straight smooth trunk. Hardier than trees of Japanese origin photos)
  • 'Variegata' (weak growing, small leaved form with a narrow white rim around the margin of the leaf),
  • 'Parkview' (selection with good vase-shape, size similar to species)
  • 'Urban Ruby' (red autumn colour)

It has also hybridised with Zelkova carpinifolia in Europe, the hybrid being named Zelkova × verschaffeltii.[3]

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

The tree is a symbol of a number of Japanese cities and prefectures: Saitama Prefecture, Miyagi Prefecture, Fukushima Prefecture, Fukushima-shi, Abiko-shi, Tachikawa-shi, Yokohama-shi, Machida City in Tokyo Metropolis District and more.

According to statistics data investigated by Korea Forest Service in 1989, the most numbers of old trees over 500 years were Zelkova serrata, while more than 10 old trees have been registered as Natural momuments of Korea.[10]

Suppliers[edit]

Within the United Kingdom, the Royal Horticultural Society's Plantfinder currently lists 38 suppliers for the pure species and associated varieties.[11]

Gallery[edit]

References[edit]

  1. ^ Osaka Toyono County: Noma Keyaki (in Japanese; google translation)
  2. ^ a b Flora of China: Zelkova serrata
  3. ^ a b c d e Andrews, S. (1994). Tree of the year: Zelkova. Int. Dendrol. Soc. Yearbook 1993: 11-30.
  4. ^ a b c Rehder, Alfred. Manual of Cultivated Trees and Shrubs. 2. New York: The Macmillian Company, 1949. Print.
  5. ^ Dirr, Michael A.. Manual of Woody Landscape Plants: Their Identification, Ornamental Characteristics, Culture, Propagation and Uses. 3. Champaign: Stipes Publishing Company, 1975. Print.
  6. ^ "#820 Zelkova Serrata." Floridata. 01 25 2004. 4 May 2009 .
  7. ^ New York City Parks Street Tree List
  8. ^ "RHS Plant Selector - Zelkova serrata". Retrieved 10 June 2013. 
  9. ^ Zelkova serrata 'Green Vase' photos
  10. ^ Lee, chang-bok(1989). 검팽나무와 노란팽나무. 《자생식물》 16: 86. Accessed on October 9th, 2013
  11. ^ Plantfinder
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Notes

Comments

The bark and leaves are used medicinally.
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