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Overview

Brief Summary

Acer palmatum, called Japanese maple or smooth Japanese maple (Japanese: irohamomiji, or momiji) is a deciduous shrub or small tree (generally 6–10 m tall) with low branches and a rounded to dome-shaped crown, native to Japan, North and South Korea, China, eastern Mongolia, and southeast Russia (Wikipedia 2011). Hundreds of cultivars are grown around the world as an ornamental and specimen tree for their dramatic leaf shapes and colors, and are widely used in bonsai.

Development of cultivars started in Japan in the 1700s, where patient and discerning gardeners selected and bred or used grafting to propagate attractive variants in leaf lobing, toothing, leaf color (ranging from yellow to green to red, purple, and bronze), and bark color, as well as overall size and form as a tree or shrub (Vertrees and Gregory 2009). There may be more than 1000 varieties and cultivars, including hybrids or grafts with closely related species, such as A. duplicatoserratum, A. japonicum (downy Japanese maple), A. pseudosieboldianum (Korean maple), A. shirasawanum (fullmoon maple) and A. sieboldianum (Siebold's maple). At least 350 cultivars are used in Europe and North America (Vertrees and Gregory 2009). In addition, the term “Japanese maple” may be used to refer to any of the 23 species of Acer that are native to Japan, which leads to greater variation of trees sold commercially as Japanese maples (Vertrees and Gregory 2009),

Acer palmatum has opposite, palmately lobed leaves, 4–12 cm long and wide, with five, seven, or nine acutely pointed finger-like lobes. The flowers are produced in inconspicuous small cymes, the individual flowers with five red or purple sepals and five whitish petals. The fruit is a pair of winged samaras (nutlets with stiff, fibrous, papery wings that aid in wind dispersal). Each samara 2–3 cm long with a 6–8 mm seed (Wikipedia, 2011).

Acer species, including A. palmatum, are variously classified in a family of their own, the Aceraceae, or are included together with the Hippocastanaceae in the family Sapindaceae. Modern classifications, including the Angiosperm Phylogeny Group system, favor inclusion in Sapindaceae (Wikipedia 2011).

Acer palmatum was named by Swedish doctor-botanist Carl Peter Thunberg, who traveled in Japan in the late 1700s and returned with drawings of this small tree. He gave it the species epithet “palmatum,” after the hand-like shape of its leaves. Japanese gardeners referred to this group of maples as “kaede” and “momiji,” referring to “frogs’ hands” or “babies’ hands,” (Arbor Day Foundation 2011).
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Comprehensive Description

Derivation of specific name

palmatum: palmate, like a hand
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Distribution

National Distribution

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Trees deciduous, andromonoecious, to 15 m tall. Bark greenish gray or light brown, smooth. Branchlets grayish green, glabrous; winter buds purplish red, conical, small, with 5 pairs of scales, ciliate, terminal buds usually absent. Petiole 2-6 cm; leaf blade suborbicular, 3-6 × 4-8 cm, membranous to papery, yellowish brown pubescent when unfolding, soon glabrous except for axillary tuft of hairs on abaxial surface, base cordate to subtruncate, palmately 5- or 7-lobed to middle; lobes lanceolate, margin irregularly doubly serrate, apex long acuminate. Inflorescence corymbose-paniculate, 10-20-flowered, 3-4 cm, half-pendulous, subtended by 1 or 2 pairs of leaves. Flowers opening with leaves. Sepals 5, purplish red, oblong to oblanceolate, ca. 3 mm, pubescent near margin. Petals pale yellow to pinkish white, broadly obovate, smaller than sepals, glabrous. Stamens 8, exserted, ca. 3.5 mm, shorter in pistillate flowers, inserted at inside of disk. Ovary glabrous; style long, topped by divergent stigmas. Abortive pistil in staminate flowers minute. Samaras ca. 1.5 cm with wing, glabrous; wings spreading at obtuse angle; nutlets elliptic-convex, only slightly veined with thin, weak wall. Fl. Apr-May, fr. Sep. 2n = 26.
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Ecology

Habitat

Habitat & Distribution

Widely cultivated in gardens in China [native to Japan and S Korea].
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Associations

In Great Britain and/or Ireland:
Foodplant / internal feeder
larva of Anoplophora chinensis feeds within wood of sapling of Acer palmatum

Foodplant / saprobe
fruitbody of Auricularia auricula-judae is saprobic on wood of Acer palmatum
Other: minor host/prey

Foodplant / saprobe
gregarious, immersed, zonate pycnidium of Phomopsis coelomycetous anamorph of Diaporthe pustulata is saprobic on dead branch of Acer palmatum
Remarks: season: winter

Foodplant / saprobe
fruitbody of Panellus stipticus is saprobic on live trunk (wounded) of Acer palmatum

Foodplant / parasite
Sawadaea tulasnei parasitises Acer palmatum

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General Ecology

Culture

Acer palmatum needs a fertile, well drained, acidic soil.

Light: Partial or filtered shade is best in warmer regions. In Florida, full shade is okay. Farther north, more sun is better. The purple-leaved cultivars require full sun or their leaves will be green.

Moisture: Not drought tolerant. Japanese maple does best with regular watering.

Hardiness: USDA Zones 6 - 8. Some cultivars are hardy to zone 5B, and some can take the heat in zone 9A.

Propagation: Most Japanese maple cultivars are grafted on to special root stocks. They also can be propagated by rooting softwood cuttings in spring and summer. Japanese maple will grow from seeds, and seedlings tend to be faster growing, stronger and more drought tolerant than the cultivars and many are just as interesting. You take your chances with seeds!

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Evolution and Systematics

Functional Adaptations

Functional adaptation

Leading edge of seed creates vortex lift: maple
 

The leading edge of spinning hornbeam and maple seeds provides lift by generating a tornado-like vortex.

                       
  "The twirling seeds of maple trees spin like miniature helicopters as they fall to the ground. Because the seeds descend slowly as they swirl, they can be carried aloft by the wind and dispersed over great distances. Just how the seeds manage to fall so slowly, however, has mystified scientists...The research, led by David Lentink, an assistant professor at Wageningen, and Michael H. Dickinson, the Zarem Professor of Bioengineering at Caltech, revealed that, by swirling, maple seeds generate a tornado-like vortex that sits atop the front leading edge of the seeds as they spin slowly to the ground. This leading-edge vortex lowers the air pressure over the upper surface of the maple seed, effectively sucking the wing upward to oppose gravity, giving it a boost. The vortex doubles the lift generated by the seeds compared to nonswirling seeds." (Caltech Media Relations 2009)

[Video showing vortices can be downloaded from http://mr.caltech.edu/assets/619-mapleseed.mp4.]

  Learn more about this functional adaptation.
  • Lentink, D; Dickson, WB; van Leeuwen, JL; Dickinson, MH. 2009. Leading-edge vortices elevate lift of autorotating plant seeds. Science. 324(5933): 1438-1440.
  • Svitil, K. 2009. Maple seeds and animals exploit the same trick to fly. California Institute of Technology Press Release [Internet], Accessed June 11.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Acer palmatum

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


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Statistics of barcoding coverage: Acer palmatum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 33
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

Acer palmatum

Acer palmatum, called Japanese Maple or Smooth Japanese Maple (Japanese: irohamomiji, イロハモミジ, or momiji, 紅葉) is a species of woody plant native to Japan, North Korea, South Korea, China, eastern Mongolia, and southeast Russia.[2] Many different cultivars of this maple have been selected and they are grown worldwide for their attractive leaf shapes and colors. They are highly sought after and are relatively costly trees given their size.[3]

Contents

Description

Acer palmatum is a deciduous shrub or small tree reaching heights of 6–10 m, rarely 16 m, often growing as an understory plant in shady woodlands. It may have multiple trunks joining close to the ground. In habit, it is often shaped like a hemisphere (especially when younger) or takes on a dome-like form, especially when mature.[4] The leaves are 4–12 cm long and wide, palmately lobed with five, seven, or nine acutely pointed lobes. The flowers are produced in small cymes, the individual flowers with five red or purple sepals and five whitish petals. The fruit is a pair of winged samaras, each samara 2–3 cm long with a 6–8 mm seed. The seeds of Japanese maple and similar species require stratification in order to germinate.[4][5]

Even in nature, Acer palmatum displays considerable genetic variation: even seedlings from the same parent tree typically show differences in such aspects as leaf size and shape, and color.[4]

Three subspecies are recognised:[4][5]

  • Acer palmatum subsp. palmatum. Leaves small, 4–7 cm wide, with five or seven lobes and double-serrate margins; seed wings 10–15 mm. Lower altitudes throughout central and southern Japan (not Hokkaido).
  • Acer palmatum subsp. amoenum (Carrière) H.Hara. Leaves larger, 6–12 cm wide, with seven or nine lobes and single-serrate margins; seed wings 20–25 mm. Higher altitudes throughout Japan and South Korea.
  • Acer palmatum subsp. matsumurae Koidz. Leaves larger, 6–12 cm wide, with seven (rarely five or nine) lobes and double-serrate margins; seed wings 15–25 mm. Higher altitudes throughout Japan.

Cultivation and uses

This Japanese Maple shows a dome-like shape.

Japanese Maple has been grown in temperate areas around the world since the 1800s, but had been cultivated in Japan for centuries.[4]. The first specimen of the tree reached England in 1820.

When Swedish doctor-botanist Carl Peter Thunberg traveled in Japan late in the eighteenth century, he secreted out drawings of a small tree that would eventually become synonymous with the high art of oriental gardens[6]. He gave it the species name palmatum after the hand-like shape of its leaves. This would hardly surprise the Japanese who for centuries referred to their group of maples as kaede and momiji, references to the 'hands' of frogs[7] and babies[citation needed], respectively.

For centuries Japanese horticulturalists have developed cultivars from maples found in their country and nearby Korea and China. They are a popular choice for bonsai[8] enthusiasts and have been used throughout the history of the art.

Today numerous cultivars are readily available commercially and are a popular item at garden centres and other retail stores in Europe and North America. Red-leafed cultivars are the most popular, followed by cascading green shrubs with deeply dissected leaves.[4]

Growing conditions

Fall Maples in Nara Japan

Acer palmatum includes hundreds of named cultivars with countless forms, colors, leaf types, sizes, and preferred growing conditions. Heights of mature specimens can range from 0.5 m to 25 m, depending on type. Some tolerate sun, and others like shade. Almost all are adaptable and blend well with companion plants. The trees are particularly suitable for borders and ornamental paths because the root systems are compact and not invasive. Well drained soil is preferred, and the trees grow strongest when not over-fertilized. Many varieties of Acer palmatum are successfully grown in containers.[9]

Pruning

If space is not a constraint, no pruning is necessary except to remove any dead branches. Some growers prefer to shape their trees artistically or to thin out interior branches to better expose the graceful main branches, especially in winter.

Cultivars

Over 1,000 cultivars have been chosen for particular characteristics, which are typically propagated by asexual reproduction such as cuttings, tissue culture, budding or grafting. Some of these are not in cultivation in the Western world or have been lost over the generations, but many new cultivars are developed each decade.[4] Cultivars are chosen for phenotypical aspects such as leaf shape and size (shallowly to deeply lobed, some also palmately compound), leaf colour (ranging from chartreuse through dark green or from red to dark purple, others variegated with various patterns of white and pink), bark texture and colour, and growth pattern. Some cultivars are sturdy trees that are larger and more hardy or vigorous than is typical of the species. Many are shrubs rarely reaching over 0.5 m in height. A few very delicate cultivars are typically grown in pots and rarely reach heights of over 30 cm. Some of the more distorted or dwarfed cultivars are grown from witch's brooms, but more are based upon clippings taken from plants that are mutated and/or have been artificially selected over many generations.[4]

In Japan, iromomiji is used as an accent tree in Japanese gardens, providing gentle shade next to the house in the summer and beautiful colours in fall. Many cultivars have characteristics that come into prominence during different seasons, including the colour of new or mature leaves, extraordinary fall colour, colour and shape of samaras, or even bark that becomes more brightly coloured during the winter. Some cultivars can scarcely be distinguished from others unless labeled. In some cases, identical cultivars go by different names, while in other cases, different cultivars may be given the same name.

Example cultivars

Example of leaf variation among various cultivars of Japanese Maple
112 year old bonsai example, from the Brooklyn Botanic Garden.

A selection of notable or popular cultivars, with brief notes about characteristics that apply during at least one season, includes the following.[4]

  • 'Aka shigitatsu sawa', pinkish-white leaves with green veins
  • 'Ao ba jo'—a dwarf with bronze-green summer foliage
  • 'Atropurpureum'—wine-red, including new branches
  • 'Bloodgood'—an improved cultivar of 'Atropurpureum'
  • 'Butterfly'—small leaves with white borders
  • 'Dissectum'—lace-like leaves, drooping habit
  • 'Golden Pond'—greenish-yellow summer foliage
  • 'Goshiki koto hime'—a delicate, variegated dwarf
  • 'Higasa yama'—crinkled leaves variegated with yellow
  • 'Hupp's Dwarf'—a small, dense shrub with miniature leaves
  • 'Issai nishiki kawazu'—very rough, rigid bark
  • 'Kagiri nishiki'—similar to 'Butterfly' but more pinkish tones
  • 'Karasu gawa'—slow-growing variegate with brilliant pink and white
  • 'Katsura'—yellow-green leaves tipped with orange
  • 'Koto no ito'—light green, thread-like leaves
  • 'Little Princess'—a sparsely-branched dwarf with irregular habit
  • 'Mama'—a bushy dwarf with extremely variable foliage
  • 'Masu murasaki'—a shrubby tree with purple leaves
  • 'Mizu kuguri'—orange-tinted new growth and very wide habit
  • 'Nishiki gawa'—pinetree-like bark desirable for bonsai
  • 'Nomura nishiki'—dark purple, lace-like leaves
  • 'Ojishi'—tiny dwarf, grows only a few centimetres per year
  • 'Osakazuki'—tree-like shrub with spectacular autumn colour
  • 'Peaches and Cream'—similar to 'Aka shigitatsu sawa'
  • 'Pink Filigree'—finely dissected, brownish-pink leaves
  • 'Red Filigree Lace'—delicate, finely dissected, dark purple
  • 'Sango kaku'—"coralbark maple" with pinkish-red bark
  • 'Seiryu'—a green, tree-like shrub with finely dissected leaves
  • 'Shikage ori nishiki'—vase-shaped shrub with dull purple foliage
  • 'Skeeter's Broom'—derived from a 'Bloodgood' witch's broom
  • 'Tamukeyama'—finely dissected, dark purple, cascading habit
  • 'Tropenburg'—slender, upright grower, convex lobes, purple leaves
  • 'Tsuma gaki'—yellow leaves with reddish-purple borders
  • 'Yuba e'—upright tree with scarlet variegation
Red-foliaged plants such as this are sold under names such as 'Atropurpureum' and 'Bloodgood'.

In addition to the cultivars described above, a number of Cultivar Groups have been naturally selected over time to such an extent that seedlings often resemble the parent. Many of these are sold under the same name as the cultivars, or even propagated by grafting, so there is often much ambiguity in distinguishing them.[4]. In particular, a number of dark-red Japanese maples are sold with the names "Atropurpureum" and "Bloodgood." Many maples with delicate lace-like foliage are sold under names such as "Dissectum", "Filigree" and "Laceleaf."[4].

Similar species

The term "Japanese Maple" is also sometimes used to describe other species within series Palmata that are similar to A. palmatum and are native to China, Korea or Japan including:

Given that these maples are phenotypically variable within each species, and may hybridise with one another, distinguishing between them may be a matter of gradient speciation. In commercial propagation, A. palmatum is often used as rootstock for these other species.[4]

Gallery

Notes

  1. ^ Stevens, P. F. (2001 onwards). Angiosperm Phylogeny Website. Version 9, June 2008 [and more or less continuously updated since]. http://www.mobot.org/MOBOT/research/APweb/.
  2. ^ Germplasm Resources Information Network: Acer palmatum
  3. ^ http://www.artificialplantsandtrees.com/Interior_Decor/Discover_Maple_Trees/discover_maple_trees.html
  4. ^ a b c d e f g h i j k l van Gelderen, C.J. & van Gelderen, D.M. (1999). Maples for Gardens: A Color Encyclopedia.
  5. ^ a b Rushforth, K. (1999). Trees of Britain and Europe. Collins ISBN 0-00-220013-9.
  6. ^ http://www.arborday.org/shopping/trees/japaneseredmaple/history.cfm
  7. ^ (Japanese) Etymology of 楓. The word kaede derives from kaeru te "frog hand" and went through the intermediary form kaende.
  8. ^ D'Cruz, Mark. "Acer palmatum Bonsai Care Guide". Ma-Ke Bonsai. http://makebonsai.com/guide/bonsailink.asp?quicklink=5021&name=Acer_palmatum. Retrieved 2010-11-26. 
  9. ^ Vertrees, J.D. (1987) Japanese Maples. Timber Press, Inc. ISBN 0-88192-048-7

Bibliography

Philips, Roger. Trees of North America and Europe, Random House, Inc., New York ISBN 0-394-50259-0, 1979.

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Notes

Comments

This species is a famous small ornamental tree with many cultivars.
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