''Acer platanoides'', commonly known as the Norway maple, is a species of
maple
''Acer'' () is a genus of trees and shrubs commonly known as maples. The genus is placed in the family Sapindaceae.Stevens, P. F. (2001 onwards). Angiosperm Phylogeny Website. Version 9, June 2008 nd more or less continuously updated since http ...
native to eastern and central Europe and western Asia, from
Spain
, image_flag = Bandera de España.svg
, image_coat = Escudo de España (mazonado).svg
, national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond")
, national_anthem = (English: "Royal March")
, i ...
east to
Russia
Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...
, north to southern
Scandinavia
Scandinavia; Sámi languages: /. ( ) is a subregion#Europe, subregion in Northern Europe, with strong historical, cultural, and linguistic ties between its constituent peoples. In English usage, ''Scandinavia'' most commonly refers to Denmark, ...
and southeast to northern
Iran
Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...
.
It was introduced to North America in the mid-1700s as a
shade tree
A shade tree is a large tree whose primary role is to provide shade in the surrounding environment due to its spreading canopy (forest), canopy and crown (botany), crown, where it may give shelter from sunlight in the heat of the summer for peopl ...
.
It is a member of the family
Sapindaceae
The Sapindaceae are a family of flowering plants in the order Sapindales known as the soapberry family. It contains 138 genera and 1858 accepted species. Examples include horse chestnut, maples, ackee and lychee.
The Sapindaceae occur in tempera ...
.
Description
''Acer platanoides'' is a
deciduous
In the fields of horticulture and Botany, the term ''deciduous'' () means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, aft ...
tree, growing to tall with a trunk up to in diameter, and a broad, rounded
crown
A crown is a traditional form of head adornment, or hat, worn by monarchs as a symbol of their power and dignity. A crown is often, by extension, a symbol of the monarch's government or items endorsed by it. The word itself is used, partic ...
. The
bark is grey-brown and shallowly grooved. Unlike many other maples, mature trees do not tend to develop a shaggy bark. The shoots are green at first, soon becoming pale brown. The winter buds are shiny red-brown.
The
leaves
A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...
are
opposite,
palmately lobed with five lobes, long and across; the lobes each bear one to three side teeth, and an otherwise smooth margin. The leaf
petiole is long, and secretes a milky juice when broken. The autumn colour is usually yellow, occasionally orange-red.
![Acer platanoides flower kz](https://upload.wikimedia.org/wikipedia/commons/1/1f/Acer_platanoides_flower_kz.jpg)
The flowers are in
corymb
Corymb is a botanical term for an inflorescence with the flowers growing in such a fashion that the outermost are borne on longer pedicels than the inner, bringing all flowers up to a common level. A corymb has a flattish top with a superficial re ...
s of 15–30 together, yellow to yellow-green with five sepals and five petals long; flowering occurs in early spring before the new leaves emerge. The fruit is a double
samara
Samara ( rus, Сама́ра, p=sɐˈmarə), known from 1935 to 1991 as Kuybyshev (; ), is the largest city and administrative centre of Samara Oblast. The city is located at the confluence of the Volga and the Samara (Volga), Samara rivers, with ...
with two winged
seed
A seed is an embryonic plant enclosed in a protective outer covering, along with a food reserve. The formation of the seed is a part of the process of reproduction in seed plants, the spermatophytes, including the gymnosperm and angiospe ...
s. the seeds are disc-shaped, strongly flattened, across and thick. The wings are long, widely spread, approaching a 180° angle. It typically produces a large quantity of viable seeds.
Under ideal conditions in its native range, Norway maple may live up to 250 years, but often has a much shorter life expectancy; in North America, for example, sometimes only 60 years. Especially when used on streets, it can have insufficient space for its root network and is prone to the roots wrapping around themselves, girdling and killing the tree. In addition, their roots tend to be quite shallow and thereby they easily out-compete nearby plants for nutrient uptake. Norway maples often cause significant damage and cleanup costs for municipalities and homeowners when branches break off in storms as it does not have strong wood.
Classification and identification
![Norway-maple-bark](https://upload.wikimedia.org/wikipedia/commons/3/3a/Norway-maple-bark.jpg)
The Norway maple is a member (and is the
type species
In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...
) of the section ''Platanoidea'' Pax, characterised by flattened, disc-shaped seeds and the shoots and leaves containing milky sap. Other related species in this section include ''
Acer campestre
''Acer campestre'', known as the field maple, is a flowering plant species in the family Sapindaceae. It is native to much of continental Europe, Britain, southwest Asia from Turkey to the Caucasus, and north Africa in the Atlas Mountains. It has ...
'' (field maple), ''
Acer cappadocicum
''Acer cappadocicum'', the Cappadocian maple, is a maple native to Asia, from central Turkey (ancient Cappadocia) east along the Caucasus, the Himalayas, to southwestern China.Mitchell, A. F. (1974). ''A Field Guide to the Trees of Britain and No ...
'' (Cappadocian maple), ''
Acer lobelii
Acer may refer to:
* ''Acer'' (plant), the genus of trees and shrubs commonly known as maples
* Acer Inc., a computer company in Taiwan
** Acer Laboratories Incorporated, a subsidiary company of Acer, Inc., that designs and manufactures integrate ...
'' (Lobel's maple), and ''
Acer truncatum
''Acer truncatum'', the Shantung maple, Shandong maple, or purpleblow maple, is a maple native to northern China, in the provinces of Gansu, Hebei, Henan, Jiangsu, Jilin, Liaoning, Inner Mongolia, Shaanxi, Shandong, Shanxi, and to Korea.
It is a ...
'' (Shandong maple). From the field maple, the Norway maple is distinguished by its larger leaves with pointed, not blunt, lobes, and from the other species by the presence of one or more teeth on all of the lobes.
It is also frequently confused with the more distantly related ''
Acer saccharum
''Acer saccharum'', the sugar maple, is a species of flowering plant in the soapberry and lychee family Sapindaceae. It is native to the hardwood forests of eastern Canada and eastern United States. Sugar maple is best known for being the prima ...
'' (sugar maple). The sugar maple is easy to differentiate by clear sap in the
petiole (leaf stem); Norway maple petioles have white sap. The tips of the points on Norway maple leaves reduce to a fine "hair", while the tips of the points on sugar maple leaves are, on close inspection, rounded. On mature trees, sugar maple bark is more shaggy, while Norway maple bark has small, often criss-crossing grooves. While the shape and angle of leaf lobes vary somewhat within all maple species, the leaf lobes of Norway maple tend to have a more triangular (acuminate) shape, in contrast to the more finely toothed lobes of sugar maples, that narrow towards the base.
[ Flowering and seed production begins at ten years of age, however large quantities of seeds are not produced until the tree is 20. As with most maples, Norway maple is normally dioecious (separate male and female trees), occasionally monoecious, and trees may change gender from year to year.
The fruits of Norway maple are paired samaras with widely diverging wings,] distinguishing them from those of sycamore, ''Acer pseudoplatanus'' which are at 90 degrees to each other. Norway maple seeds are flattened, while those of sugar maple are globose. The sugar maple usually has a brighter orange autumn color, where the Norway maple is usually yellow, although some of the red-leaved cultivars appear more orange.
The flowers emerge in spring before the leaves and last 2-3 weeks. Leafout of Norway maple occurs roughly when air temperatures reach 55°F (12°C) and there is at least 13 hours of daylight. Leaf drop in autumn is initiated when day lengths fall to approximately 10 hours. Depending on the latitude, leaf drop may vary by as much as three weeks, beginning in the second week of October in Scandinavia and the first week of November in southern Europe. Unlike some other maples that wait for the soil to warm up, ''A. platanoides'' seeds require only three months of exposure to temperatures lower than and will sprout in early spring, around the same time that leafout begins. Norway maple does not require freezing temperatures for proper growth, however it is adapted to higher latitudes with long summer days and does not perform well when planted south of the 37th parallel, the approximate southern limit of its range in Europe. Further, most North American Norway maples are believed descended from stock brought from Germany, at approximately 48N to 54N, not the more southerly ecotypes found in Italy and the Balkans that evolved for similar lighting conditions as the continental United States. The heavy seed crop and high germination rate contributes to its invasiveness in North America, where it forms dense monotypic stands that choke out native vegetation. The tree is also capable of growing in low lighting conditions within a forest canopy, leafs out earlier than most North American maple species, and its growing season tends to run longer as the lighting conditions of the United States (see above) result in fall dormancy occurring later than it does in the higher latitude of Europe. It is one of the few introduced species that can successfully invade and colonize a virgin forest. By comparison, in its native range, Norway maple is rarely a dominant species and instead occurs mostly as a scattered understory tree.
Cultivation and uses
The wood is hard, yellowish-white to pale reddish, with the heartwood not distinct; it is used for furniture and woodturning
Woodturning is the craft of using a wood lathe with hand-held tools to cut a shape that is symmetrical around the axis of rotation. Like the potter's wheel, the wood lathe is a simple mechanism that can generate a variety of forms. The operator ...
. Norway maple sits ambiguously between hard and soft maple with a Janka hardness
The Janka hardness test (; ), created by Austrian-born American researcher Gabriel Janka (1864–1932), measures the resistance of a sample of wood to denting and wear. It measures the force required to embed an steel ball halfway into a sample ...
of . The wood is rated as non-durable to perishable in regard to decay resistance. In Europe, it is used for furniture, flooring and musical instruments. This species as grown in the former Yugoslavia is also called Bosnian maple, and is probably the maple used by the famous Italian violin makers, Stradivari
Antonio Stradivari (, also , ; – 18 December 1737) was an Italian luthier and a craftsman of string instruments such as violins, cellos, guitars, violas and harps. The Latinized form of his surname, ''Stradivarius'', as well as the colloquia ...
and Guarneri
The Guarneri (, , ), often referred to in the Latinized form Guarnerius, is the family name of a group of distinguished luthiers from Cremona in Italy in the 17th and 18th centuries, whose standing is considered comparable to those of the Amati an ...
.
Norway maple has been widely taken into cultivation in other areas, including western Europe northwest of its native range. It grows north of the Arctic Circle
The Arctic Circle is one of the two polar circles, and the most northerly of the five major circles of latitude as shown on maps of Earth. Its southern equivalent is the Antarctic Circle.
The Arctic Circle marks the southernmost latitude at w ...
at Tromsø
Tromsø (, , ; se, Romsa ; fkv, Tromssa; sv, Tromsö) is a List of municipalities of Norway, municipality in Troms og Finnmark county, Norway. The administrative centre of the municipality is the Tromsø (city), city of Tromsø.
Tromsø lies ...
, Norway
Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...
. In North America, it is planted as a street and shade tree as far north as Anchorage, Alaska
Anchorage () is the largest city in the U.S. state of Alaska by population. With a population of 291,247 in 2020, it contains nearly 40% of the state's population. The Anchorage metropolitan area, which includes Anchorage and the neighboring Ma ...
. In Ontario
Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central Ca ...
, it is common in cultivation north to Sault Ste. Marie and Sudbury Sudbury may refer to:
Places Australia
* Sudbury Reef, Queensland
Canada
* Greater Sudbury, Ontario (official name; the city continues to be known simply as Sudbury for most purposes)
** Sudbury (electoral district), one of the city's federal e ...
; although not considered reliably hardy northward, it has been established at Kapuskasing
Kapuskasing is a town on the Kapuskasing River in the Cochrane District of Northern Ontario, Canada, approximately east of Hearst. The town was known as MacPherson until 1917, when the name was changed so as not to conflict with another railw ...
and Iroquois Falls
Iroquois Falls is a town in Northern Ontario, Canada, with a population of 4,537 at the 2016 census.
The town centre lies 11 km east of Hwy 11 on the banks of the Abitibi River, west of Lake Abitibi. Timmins, one of the largest cities in ...
, and even at Moose Factory
Moose Factory is a community in the Cochrane District, Ontario, Canada. It is located on Moose Factory Island, near the mouth of the Moose River, which is at the southern end of James Bay. It was the first English-speaking settlement in lands no ...
. It is most recommended in USDA Hardiness Zones 4 to 7 but will grow in warmer zones (at least up to Zone 10) where summer heat is moderate, as along the Pacific coast south to the Los Angeles basin
The Los Angeles Basin is a sedimentary basin located in Southern California, in a region known as the Peninsular Ranges. The basin is also connected to an anomalous group of east-west trending chains of mountains collectively known as the Tr ...
. During the 1950s–60s it became popular as a street tree due to the large-scale loss of American elm
''Ulmus americana'', generally known as the American elm or, less commonly, as the white elm or water elm, is a species of elm native to eastern North America, naturally occurring from Nova Scotia west to Alberta and Montana, and south to Flor ...
s from Dutch elm disease
Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Although believed to be originally native to Asia, the disease was accidentally introduced into Americas, America ...
.
It is favored due to its tall trunk and tolerance of poor, compacted soil
Soil, also commonly referred to as earth or dirt, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life. Some scientific definitions distinguish ''dirt'' from ''soil'' by restricting the former te ...
s and urban pollution, conditions in which the sugar maple
''Acer saccharum'', the sugar maple, is a species of flowering plant in the soapberry and lychee family Sapindaceae. It is native to the hardwood forests of eastern Canada and eastern United States. Sugar maple is best known for being the prima ...
has difficulty. It has become a popular species for bonsai
Bonsai ( ja, 盆栽, , tray planting, ) is the Japanese art of growing and training miniature trees in pots, developed from the traditional Chinese art form of ''penjing''. Unlike ''penjing'', which utilizes traditional techniques to produce ...
in Europe, and is used for medium to large bonsai sizes and a multitude of styles. Norway maples are not typically cultivated for maple syrup production due to the lower sugar content of the sap compared to sugar maple.
Cultivars
Many cultivar
A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture, ...
s have been selected for distinctive leaf shapes or colorations, such as the dark purple of 'Crimson King' and 'Schwedleri', the variegated leaves of 'Drummondii', the light green of 'Emerald Queen', and the deeply divided, feathery leaves of 'Dissectum' and 'Lorbergii'. The purple-foliage cultivars have orange to red autumn colour. 'Columnare' is selected for its narrow upright growth. The cultivars 'Crimson King' and 'Prigold' () have gained the Royal Horticultural Society
The Royal Horticultural Society (RHS), founded in 1804 as the Horticultural Society of London, is the UK's leading gardening charity.
The RHS promotes horticulture through its five gardens at Wisley (Surrey), Hyde Hall (Essex), Harlow Carr (Nort ...
's Award of Garden Merit
The Award of Garden Merit (AGM) is a long-established annual award for plants by the British Royal Horticultural Society (RHS). It is based on assessment of the plants' performance under UK growing conditions.
History
The Award of Garden Merit ...
.
As an invasive species in North America
The Norway maple was introduced to northeastern North America between 1750 and 1760 as an ornamental shade tree. It was brought to the Pacific Northwest in the 1870s. Today, Norway maples tend to be most common in the Pacific Northwest, the Maritimes, and in southern Ontario. The roots of Norway maples grow very close to the ground surface, starving other plants of moisture. For example, lawn grass (and even weeds) will usually not grow well beneath a Norway maple, but English Ivy, with its minimal rooting needs, may thrive. In addition, the dense canopy of Norway maples can inhibit understory
In forestry and ecology, understory (American English), or understorey (Commonwealth English), also known as underbrush or undergrowth, includes plant life growing beneath the forest canopy without penetrating it to any great extent, but abov ...
growth. Some have suggested Norway maples may also release chemicals to discourage undergrowth, although this claim is controversial. ''A. platanoides'' has been shown to inhibit the growth of native saplings as a canopy tree or as a sapling. The Norway maple also suffers less herbivory
A herbivore is an animal anatomically and physiologically adapted to eating plant material, for example foliage or marine algae, for the main component of its diet. As a result of their plant diet, herbivorous animals typically have mouthpart ...
than the sugar maple, allowing it to gain a competitive advantage against the latter species. As a result of these characteristics, it is considered invasive in some states, and has been banned for sale in New Hampshire
New Hampshire is a U.S. state, state in the New England region of the northeastern United States. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Gulf of Maine to the east, and the Canadian province of Quebec t ...
and . The state of New York
New York, officially the State of New York, is a state in the Northeastern United States. It is often called New York State to distinguish it from its largest city, New York City. With a total area of , New York is the 27th-largest U.S. state ...
has classified it as an invasive plant species. Despite these steps, the species is still available and widely used for urban plantings in many areas.
Education about the invasive nature of the tree is expanding thanks to organizations like the National Audubon Society.
File:Acer platanoides fruit kz.jpg, Fruit (samara): note the flat seed capsule and the angle of the "wings"
File:2014-10-30 10 39 54 Norway Maple foliage during autumn on Durham Avenue in Ewing, New Jersey.JPG, Typical yellow fall foliage
File:2014-10-30 09 32 43 Norway Maple foliage during autumn in Ewing, New Jersey.JPG, Atypical orange-red fall colour
File:Acer Platanoides 'schwedleri' leaf.jpg, Purple leaves of cultivar 'Schwedleri'
File:Acer platanoides twig and buds.jpg, Twig and buds
Natural enemies
The larvae of a number of species of Lepidoptera
Lepidoptera ( ) is an order (biology), order of insects that includes butterfly, butterflies and moths (both are called lepidopterans). About 180,000 species of the Lepidoptera are described, in 126 Family (biology), families and 46 Taxonomic r ...
feed on Norway maple foliage. ''Ectoedemia sericopeza
''Ectoedemia sericopeza'', the Norway maple seedminer, is a moth of the family Nepticulidae, found in Europe and North America. It was described by the German entomologist, Philipp Christoph Zeller in 1839.
Description
The wingspan is 6–9&nb ...
'', the Norway maple seedminer, is a moth of the family Nepticulidae. The larvae emerge from eggs laid on the samara and tunnel to the seeds. Norway maple is generally free of serious diseases, though can be attacked by the powdery mildew
Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales. Powdery mildew is one of the easier plant diseases to identify, as ...
''Uncinula bicornis'', and verticillium
''Verticillium'' is a genus of fungi in the division Ascomycota, and are an anamorphic form of the family Plectosphaerellaceae. The genus used to include diverse groups comprising saprobes and parasites of higher plants, insects, nematodes, mo ...
wilt disease caused by ''Verticillium'' spp.[Phillips, D. H., & Burdekin, D. A. (1992). ''Diseases of Forest and Ornamental Trees''. Macmillan .] "Tar spots" caused by ''Rhytisma acerinum
''Rhytisma acerinum'' is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Tar spot does not usually have an adverse effect on the trees' long-term health. ''R. acerinum'' is an Ascomycete f ...
'' infection are common but largely harmless. ''Aceria pseudoplatani
''Aceria pseudoplatani'' causes the sycamore felt gall that is found on the leaves of sycamores (''Acer pseudoplatanus'') or Norway maple (''Acer platanoides
''Acer platanoides'', commonly known as the Norway maple, is a species of maple nati ...
'' is an acarine
Mites are small arachnids (eight-legged arthropods). Mites span two large orders of arachnids, the Acariformes and the Parasitiformes, which were historically grouped together in the subclass Acari, but genetic analysis does not show clear evid ...
mite that causes a 'felt gall', found on the underside of leaves of both sycamore maple (''Acer pseudoplatanus'') and Norway maples.[Plant Galls]
Retrieved : 2013-07-10
References
External links
''Acer platanoides''
- information, genetic conservation units and related resources. European Forest Genetic Resources Programme
European Forest Genetic Resources Programme (EUFORGEN) is an international network that supports the conservation and sustainable use of forest genetic resources in Europe. The programme’s tasks include to coordinate and promote ''in situ
' ...
(EUFORGEN)
Portrait of the Earth: ''Acer platanoides'' (Norway maple)
— ''with winter images''.
{{Authority control
platanoides
Trees of Asia
Trees of Europe
Flora of Western Asia
Trees of humid continental climate
Plants described in 1753
Taxa named by Carl Linnaeus