Acer saccharum

Last updated

Sugar maple
Acer saccharum 1-jgreenlee (5098070608).jpg
Status TNC G5.svg
Secure  (NatureServe)
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Sapindaceae
Genus: Acer
Section: Acer sect. Acer
Series: Acer ser. Saccharodendron
Species:
A. saccharum
Binomial name
Acer saccharum
Acer saccharum range map 1.png
Native range of Acer saccharum
Synonyms [2]
  • Acer barbatum auct. non Michx.
  • Acer barbatum f. communeAshe
  • Acer floridanum(Chapm.) Pax
  • Acer hispidumSchwer.
  • Acer leucodermeSmall
  • Acer nigrumF. Michx.
  • Acer nigrum var. glaucum(Schmidt) Fosberg
  • Acer nigrum subsp. saccharophorum(K.Koch) R.T.Clausen
  • Acer palmifoliumBorkh.
  • Acer palmifolium var. concolorSchwer.
  • Acer palmifolium f. euconcolorSchwer.
  • Acer palmifolium f. glabratumSchwer.
  • Acer palmifolium f. glaucum(Pax) Schwer.
  • Acer palmifolium var. glaucumSarg.
  • Acer palmifolium f. integrilobumSchwer.
  • Acer rugeliiPax
  • Acer saccharinum var. glaucumPax
  • Acer saccharinum var. virideSchmidt
  • Acer saccharophorumK.Koch
  • Acer saccharophorum f. angustilobatumVict. & J.Rousseau
  • Acer saccharophorum f. conicum(Fernald) J.Rousseau
  • Acer saccharophorum f. glaucum(Schmidt) J.Rousseau
  • Acer saccharophorum var. rugelii(Pax) J.Rousseau
  • Acer saccharophorum var. subvestitumVict. & Roll.-Germ.
  • Acer saccharum f. angustilobatum(Vict. & J.Rousseau) A.E.Murray
  • Acer saccharum f. conicumFernald
  • Acer saccharum f. euconcolorPax
  • Acer saccharum f. glabratumPax
  • Acer saccharum f. glaucum(Schmidt) Pax
  • Acer saccharum var. glaucum(Schmidt) Sarg.
  • Acer saccharum var. glaucumPax
  • Acer saccharum f. hispidum(Schwer.) A.E.Murray
  • Acer saccharum f. integrilobumPax
  • Acer saccharum f. pubescensPax
  • Acer saccharum var. quinquelobulatumA.E.Murray
  • Acer saccharum f. rubrocarpumA.E.Murray
  • Acer saccharum f. subvestitum(Vict. & Roll.-Germ.) A.E.Murray
  • Acer saccharum f. truncatumPax
  • Acer saccharum f. villipes(Rehder) A.E.Murray
  • Acer saccharum f. villosumPax
  • Acer saccharum var. viride(Schmidt) A.E.Murray
  • Acer saccharophorumK.Koch
  • Acer skutchiiRehder
  • Acer subglaucumBush
  • Acer subglaucum var. sinuosumBush
  • Acer treleaseanumBush
  • Saccharodendron saccharum(Marshall) Moldenke

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 the eastern United States. [3] Sugar maple is best known for being the primary source of maple syrup and for its brightly colored fall foliage. [4] It may also be called "rock maple," "sugar tree," "sweet maple," or, particularly in reference to the wood, "hard maple," [5] "birds-eye maple," or "curly maple," the last two being specially figured lumber. [6] [7]

Contents

Description

Acer saccharum is a deciduous tree normally reaching heights of 25–35 m (80–115 ft), [8] [9] and exceptionally up to 45 m (150 ft). [10] A 10-year-old tree is typically about 5 m (20 ft) tall. As with most trees, forest-grown sugar maples form a much taller trunk and narrower canopy than open-growth ones.[ citation needed ]

The leaves are deciduous, up to 20 cm (7.9 in) long and wide, [8] palmate, with five lobes and borne in opposite pairs. The basal lobes are relatively small, while the upper lobes are larger and deeply notched. In contrast with the angular notching of the silver maple, however, the notches tend to be rounded at their interior. The fall color is often spectacular, ranging from bright yellow on some trees through orange to fluorescent red-orange on others. Sugar maples also have a tendency to color unevenly in fall. In some trees, all colors above can be seen at the same time. They also share a tendency with red maples for certain parts of a mature tree to change color weeks ahead of or behind the remainder of the tree. The leaf buds are pointy and brown-colored. The recent year's growth twigs are green, and turn dark brown.[ citation needed ]

The flowers are in panicles of five to ten together, yellow-green and without petals; flowering occurs in early spring after 30–55 growing degree days. The sugar maple will generally begin flowering when it is between 10 and 200 years old. The fruit is a pair of samaras (winged seeds). The seeds are globose, 7–10 mm (9321332 in) in diameter, the wing 2–3 cm (341+14 in) long. The seeds fall from the tree in autumn, where they must be exposed to 45 days of temperatures below 4 °C (39 °F) to break their coating down. Germination of A. saccharum is slow, not taking place until the following spring when the soil has warmed and all frost danger is past. [11] [ need quotation to verify ] It is closely related to the black maple, which is sometimes included in this species, but sometimes separated as Acer nigrum. The western sugar maple (Acer grandidentatum) and southern sugar maple ((Acer floridanum) are also treated as a varieties or subspecies of northern sugar maple by some botanists. [12] [13] [14] [15]

The sugar maple can be confused with the Norway maple, which is not native to America but is commonly planted in cities and suburbs, and they are not closely related within the genus. The sugar maple is most easily identified by clear sap in the leaf petiole (the Norway maple has white sap), brown, sharp-tipped buds (the Norway maple has blunt, green or reddish-purple buds), and shaggy bark on older trees (the Norway maple bark has small grooves). Also, the leaf lobes of the sugar maple have a more triangular shape, in contrast to the squarish lobes of the Norway maple. [16] [17]

Sugar maple-yellow birch forest, Jacques-Cartier National Park, Quebec, Canada Maple birch2.jpg
Sugar maple-yellow birch forest, Jacques-Cartier National Park, Quebec, Canada

Ecology

The sugar maple is an extremely important species to the ecology of many forests in the northern United States and Canada. Pure stands are common, and it is a major component of the northern and Midwestern U.S. hardwood forests. Due to its need for cold winters, sugar maple is mostly found north of the 42nd parallel in USDA growing zones 3–5. It is less common in the southern part of its range (USDA Zone 6) where summers are hot and humid; there sugar maple is confined to ravines and moist flatlands. In the east, from Maryland southward, it is limited to the Appalachians. In the west, Tennessee represents the southern limit of its range and Missouri its southwestern limit. Collection of sap for sugar is also not possible in the southern part of sugar maple's range as winter temperatures do not become cold enough.[ citation needed ]

The minimum seed-bearing age of sugar maple is about 30 years. The tree is long-lived, typically 200 years and occasionally as much as 300.

Sugar maple is native to areas with cooler climates and requires a hard freeze each winter for proper dormancy. In northern parts of its range, January temperatures average about −18 °C (0 °F) and July temperatures about 16 °C (61 °F); in southern parts, January temperatures average about 10 °C (50 °F) and July temperatures average almost 27 °C (81 °F). [18] Seed germination also requires extremely low temperatures, the optimal being just slightly above freezing, and no other known tree species has this property. Germination of sugar maple seed in temperatures above 50 °F (10 °C) is rare to nonexistent.

Acer saccharum is among the most shade tolerant of large deciduous trees. Its shade tolerance is exceeded only by the striped maple, a smaller tree. Like other maples, its shade tolerance is manifested in its ability to germinate and persist under a closed canopy as an understory plant, and respond with rapid growth to the increased light formed by a gap in the canopy. Sugar maple can tolerate virtually any soil type short of pure sand, but does not tolerate xeric or swampy conditions.

Sugar maples are deeper-rooted than most maples and engage in hydraulic lift, drawing water from lower soil layers and exuding that water into upper, drier soil layers. This not only benefits the tree itself, but also many other plants growing around it. [19]

The mushroom Pholiota squarrosoides is known to decay the logs of the tree. [20]

Human influences have contributed to the decline of the sugar maple in many regions. Its role as a species of mature forests has led it to be replaced by more opportunistic species in areas where forests are cut over. The sugar maple also exhibits a greater susceptibility to pollution than other species of maple. Acid rain and soil acidification are some of the primary contributing factors to maple decline. Also, the increased use of salt over the last several decades on streets and roads for deicing purposes has decimated the sugar maple's role as a street tree. [21] [22]

In some parts of New England, particularly near urbanized areas, the sugar maple is being displaced by the Norway maple. The Norway maple is also highly shade tolerant, but is considerably more tolerant of urban conditions, resulting in the sugar maple's replacement in those areas. In addition, Norway maple produces much larger crops of seeds, allowing it to out-compete native species.

Cultivation and uses

Maple syrup and other food use

Collecting sap from sugar maples Maple sap buckets - Beaver Meadow Audubon Center.jpg
Collecting sap from sugar maples

The sugar maple is one of the most important Canadian trees, being, with the black maple, the major source of sap for making maple syrup. [23] Other maple species can be used as a sap source for maple syrup, but some have lower sugar content and/or produce more cloudy syrup than these two. [23] In maple syrup production from Acer saccharum, the sap is extracted from the trees using a tap placed into a hole drilled through the phloem, just inside the bark. The collected sap is then boiled. As the sap boils, the water evaporates and the syrup is left behind. Forty gallons of maple sap produces 1 gallon of syrup. In the southern part of their range, sugar maples produce little sap; syrup production is dependent on the tree growing in cooler climates. [24]

The samaras which are the seeds can be soaked, and—with their wings removed—boiled, seasoned, and roasted to make them edible. [25] The young leaves and inner bark can be eaten raw or cooked. [26]

Timber

Ultra-thin sugar maple sections from Romeyn Beck Hough's American Woods. From top to bottom, the image displays transverse, radial and tangential sections. The adjacent image shows light passing through the specimens. Note, while the title of the image in the original book is "Acer Saccharinum", sugar maple is actually Acer saccharum. Acer saccharinum is a different species better known as silver leaf maple. Houghilluminated.jpg
Ultra-thin sugar maple sections from Romeyn Beck Hough's American Woods. From top to bottom, the image displays transverse, radial and tangential sections. The adjacent image shows light passing through the specimens. Note, while the title of the image in the original book is "Acer Saccharinum", sugar maple is actually Acer saccharum. Acer saccharinum is a different species better known as silver leaf maple.

The sapwood can be white, and smaller logs may have a higher proportion of this desirable wood. [27] Bowling alleys and bowling pins are both commonly manufactured from sugar maple. Trees with wavy wood grain, which can occur in curly, quilted, and "birdseye maple" forms, are especially valued. Maple is also the wood used for basketball courts, including the floors used by the NBA, and it is a popular wood for baseball bats, along with white ash. In recent years, because white ash has become threatened by emerald ash borer, sugar maple wood has increasingly displaced ash for baseball bat production. It is also widely used in the manufacture of musical instruments, such as the members of the violin family (sides and back), guitars (neck), grand pianos (rim), and drum shells. It is also often used in the manufacture of sporting goods. [28] [29]

Canadian maple, often referred to as "Canadian hardrock maple", is prized for pool cues, especially the shafts. Some production-line cues will use lower-quality maple wood with cosmetic issues, such as "sugar marks", which are most often light brown discolorations caused by sap in the wood. The best shaft wood has a very consistent grain, with no marks or discoloration. Sugar marks usually do not affect how the cue plays, but are not as high quality as those without it. The wood is also used in skateboards, gunstocks, and flooring for its strength.[ citation needed ] [28] Canadian hardrock maple is also used in the manufacture of electric guitar necks due to its high torsional stability and the bright, crisp resonant tone it produces. If the grain is curly, with flame or quilt patterns, it is usually reserved for more expensive instruments. In high-end guitars this wood is sometimes Torrefied to cook out the Lignin resins, allowing the greater stability to climate & environmental changes, and to enhance its tonal characteristics as the instrument's resonance is more evenly distributed across the cellulose structure of the wood without the lignin.

Urban planting

Sugar maple in a suburban landscape 2014-11-02 15 25 30 Sugar Maple during autumn along Patton Drive in Ewing, New Jersey.jpg
Sugar maple in a suburban landscape

Sugar maple was a favorite street and park tree during the 19th century because it was easy to propagate and transplant, is fairly fast-growing, and has beautiful fall color. As noted above, however, it proved too delicate to continue in that role after the rise of automobile-induced pollution and was replaced by Norway maple and other hardier species. It is intolerant of road salt. Sugar Maples are commonly planted as a street tree in cities within the Mountain West region of the United States, usually a different cultivar such as the “Legacy” sugar maple.[ citation needed ] The shade and the shallow, fibrous roots may interfere with grass growing under the trees. Deep, well-drained loam is the best rooting medium, although sugar maples can grow well on sandy soil which has a good buildup of humus. Light (or loose) clay soils are also well known to support sugar maple growth. Poorly drained areas are unsuitable, and the species is especially short-lived on flood-prone clay flats. Its salt tolerance is low and it is very sensitive to boron.[ citation needed ] The species is also subject to defoliation when there are dense populations of larvae of Lepidoptera species like the rosy maple moth ( Dryocampa rubicunda ). [30]

Cultivars

  • 'Apollo' – columnar
  • 'Arrowhead' – pyramidal crown
  • 'Astis' ('Steeple') – heat-tolerant, good in southeastern USA, oval crown
  • 'Bonfire' – fast growing
  • 'Caddo' – naturally occurring southern ecotype or subspecies, from Southwestern Oklahoma, great drought and heat tolerance, good choice for the Great Plains region [31]
  • 'Columnare' ('Newton Sentry') – very narrow
  • 'Fall Fiesta' – tough-leaved, colorful in season, above-average hardiness
  • 'Goldspire' – columnar with yellow-orange fall color
  • 'Green Mountain' (PNI 0285) – durable foliage resists heat and drought, oval crown, above-average hardiness
  • 'Inferno' – possibly the hardiest cultivar, with more red fall color than 'Lord Selkirk' or 'Unity'
  • 'Legacy' – tough, vigorous and popular
  • 'Lord Selkirk' – very hardy, more upright than other northern cultivars
  • 'Monumentale' – columnar
  • 'September Flare' - very hardy, early orange-red fall color
  • 'Sweet Shadow' – lacy foliage
  • 'Temple's Upright' – almost as narrow as 'Columnare'
  • 'Unity' – very hardy, from Manitoba, slow steady growth

Use by Native Americans

The Mohegan use the inner bark as a cough remedy, and the sap as a sweetening agent, and to make maple syrup following the introduction of metal cookware by Europeans. [32]

Big trees

Comfort Maple in Pelham, Ontario Sugar Maple-Acer saccharum-Comfort Maple Conservation Area-Town of Pelham-Ontario-OHAR5725-20221023 (1).jpg
Comfort Maple in Pelham, Ontario

The United States national champion for Acer saccharum is located in Charlemont, Massachusetts. In 2007, the year it was submitted, it had a circumference of 5.92 metres (233 in; 19 ft 5 in) at 1.3 metres (4 ft 3 in) above the ground's surface, and thus a diameter at breast height of about 1.88 metres (6 ft 2 in). At that time the tree was 34.1 metres (111 ft 11 in) tall with an average crown spread of 27.7 metres (90 ft 11 in). Using the scoring system of circumference in inches plus height in feet plus 25% of crown spread in feet resulted in a total number of 368 points at the National Register of Big Trees. [33] A tree in Lyme, Connecticut, measured in 2012, had a circumference of 18 ft 3 in; 6 m, or an average diameter at breast height of about 5.8 feet (5 ft 10 in; 1.8 m). This tree had been 123 feet (37 m) tall with a crown spread of 86 feet (26 m), counting for a total number of 364 points. [34]

Leafless sugar maples in Vermont state quarter 2001 VT Proof.png
Leafless sugar maples in Vermont state quarter

The sugar maple is the state tree of the US states of New York, Vermont, West Virginia, and Wisconsin.

It is depicted on the state quarter of Vermont, issued in 2001.

Related Research Articles

<span class="mw-page-title-main">Maple syrup</span> Syrup made from the sap of maple trees

Maple syrup is a syrup made from the sap of maple trees. In cold climates, these trees store starch in their trunks and roots before winter; the starch is then converted to sugar that rises in the sap in late winter and early spring. Maple trees are tapped by drilling holes into their trunks and collecting the sap, which is processed by heating to evaporate much of the water, leaving the concentrated syrup.

<i>Quercus palustris</i> Species of oak tree

Quercus palustris, also called pin oak, swamp oak, or Spanish oak, is a tree in the red oak section of the genus Quercus. Pin oak is one of the most commonly used landscaping oaks in its native range due to its ease of transplant, relatively fast growth, and pollution tolerance.

<i>Acer saccharinum</i> Species of maple tree

Acer saccharinum, commonly known as silver maple, creek maple, silverleaf maple, soft maple, large maple, water maple, swamp maple, or white maple, is a species of maple native to the eastern and central United States and southeastern Canada. It is one of the most common trees in the United States.

<i>Acer platanoides</i> Species of flowering plant in the soapberry family Sapindaceae

Acer platanoides, commonly known as the Norway maple, is a species of maple native to eastern and central Europe and western Asia, from Spain east to Russia, north to southern Scandinavia and southeast to northern Iran. It was introduced to North America in the mid-1700s as a shade tree. It is a member of the family Sapindaceae.

<i>Acer rubrum</i> Maple tree native in North America

Acer rubrum, the red maple, also known as swamp maple, water maple, or soft maple, is one of the most common and widespread deciduous trees of eastern and central North America. The U.S. Forest Service recognizes it as the most abundant native tree in eastern North America. The red maple ranges from southeastern Manitoba around the Lake of the Woods on the border with Ontario and Minnesota, east to Newfoundland, south to Florida, and southwest to East Texas. Many of its features, especially its leaves, are quite variable in form. At maturity, it often attains a height around 30 m (100 ft). Its flowers, petioles, twigs, and seeds are all red to varying degrees. Among these features, however, it is best known for its brilliant deep scarlet foliage in autumn.

<i>Acer pseudoplatanus</i> Species of flowering plant in the lychee family Sapindaceae

Acer pseudoplatanus, known as the sycamore in the British Isles and as the sycamore maple in the United States, is a species of maple native to Central Europe and Western Asia. It is a large deciduous, broad-leaved tree, tolerant of wind and coastal exposure.

<i>Betula nigra</i> Species of birch

Betula nigra, the black birch, river birch or water birch, is a species of birch native to the Eastern United States from New Hampshire west to southern Minnesota, and south to northern Florida and west to Texas. It is one of the few heat-tolerant birches in a family of mostly cold-weather trees which do not thrive in USDA Zone 6 and up. B. nigra commonly occurs in floodplains and swamps.

<i>Acer nigrum</i> Species of flowering plant in the lychee family Sapindaceae

Acer nigrum, the black maple, is a species of maple closely related to A. saccharum, and treated by some authors as a subspecies of it, as Acer saccharum subsp. nigrum.

<i>Acer macrophyllum</i> Species of maple

Acer macrophyllum, the bigleaf maple or Oregon maple, is a large deciduous tree in the genus Acer. It is native to western North America. In addition to uses by animals, it is of some culinary and woodworking interest.

<i>Juglans cinerea</i> Species of tree

Juglans cinerea, commonly known as butternut or white walnut, is a species of walnut native to the eastern United States and southeast Canada.

<i>Betula papyrifera</i> Species of tree

Betula papyrifera is a short-lived species of birch native to northern North America. Paper birch is named after the tree's thin white bark, which often peels in paper-like layers from the trunk. Paper birch is often one of the first species to colonize a burned area within the northern latitudes, and is an important species for moose browsing. Primary commercial uses for paper birch wood are as boltwood and sawlogs, while secondary products include firewood and pulpwood. It is the provincial tree of Saskatchewan and the state tree of New Hampshire.

<i>Betula alleghaniensis</i> Species of flowering plant in the birch family Betulaceae

Betula alleghaniensis, the yellow birch, golden birch, or swamp birch, is a large tree and an important lumber species of birch native to northeastern North America. Its vernacular names refer to the golden color of the tree's bark. In the past its scientific name was Betula lutea, the yellow birch.

<i>Acer grandidentatum</i> Species of maple

Acer grandidentatum, commonly called bigtooth maple or western sugar maple, is a species of maple native to interior western North America. It occurs in scattered populations from western Montana to central Texas in the United States and south to Coahuila in northern Mexico.

<i>Acer spicatum</i> Species of maple

Acer spicatum, the mountain maple, dwarf maple, moose maple, or white maple, is a species of maple native to northeastern North America from Saskatchewan to Newfoundland, and south to Pennsylvania. It also grows at high elevations in the southern Appalachian Mountains to northern Georgia.

<i>Acer leucoderme</i> Species of maple

Acer leucoderme is a deciduous tree native to the southeastern United States from North Carolina south to northwest Florida and west to eastern Texas. It lives in the understory in moist, rocky soils on river banks, ravines, woods, and cliffs. Although generally an uncommon tree, it is most often found in the inner coastal plain and Piedmont regions of Georgia.

<span class="mw-page-title-main">Maple</span> Genus of flowering plants

Acer is a genus of trees and shrubs commonly known as maples. The genus is placed in the soapberry family, Sapindaceae, along with lychee and horse chestnut. There are approximately 132 species, most of which are native to Asia, with a number also appearing in Europe, northern Africa, and North America. Only one species, Acer laurinum, extends to the Southern Hemisphere. The type species of the genus is the sycamore maple, Acer pseudoplatanus, the most common maple species in Europe. Maples usually have easily recognizable palmate leaves and distinctive winged fruits. The closest relatives of the maples are the horse chestnuts. Maple syrup is made from the sap of some maple species. It is one of the most common genera of trees in Asia. Many maple species are grown in gardens where they are valued for their autumn colour.

<i>Carya glabra</i> Species of tree

Carya glabra, the pignut hickory, is a common, but not abundant species of hickory in the oak-hickory forest association in the Eastern United States and Canada. Other common names are pignut, sweet pignut, coast pignut hickory, smoothbark hickory, swamp hickory, and broom hickory. The pear-shaped nut ripens in September and October, has a sweet maple like smell, and is an important part of the diet of many wild animals. The wood is used for a variety of products, including fuel for home heating. Its leaves turn yellow in the Fall.

<i>Acer floridanum</i> Species of maple

Acer floridanum, commonly known as the Florida maple and occasionally as the southern sugar maple or hammock maple, is a tree that occurs in mesic and usually calcareous woodlands of the Atlantic and Gulf coastal plain in the United States, from southeastern Virginia in the north, south to central Florida, and west to Oklahoma and Texas and also common in south Illinois and Missouri

<i>Carya laciniosa</i> Species of tree

Carya laciniosa, the shellbark hickory, in the Juglandaceae or walnut family is also called kingnut, big, bottom, thick, or western shellbark, attesting to some of its characteristics. It is a slow-growing, long-lived tree, hard to transplant because of its long taproot, and subject to insect damage. The nuts, largest of all hickory nuts, are sweet and edible. Wildlife and people harvest most of them; those remaining produce seedling trees readily. The wood is hard, heavy, strong, and very flexible, making it a favored wood for tool handles. A specimen tree has been reported in Missouri with 117 cm (46 in) diameter at breast height, 36.9 m tall, and a spread of 22.6 m.

<i>Acer palmatum</i> Species of maple

Acer palmatum, commonly known as Japanese maple, palmate maple, or smooth Japanese maple (Korean: danpungnamu, 단풍나무, Japanese: irohamomiji, イロハモミジ, or momiji,, is a species of woody plant native to Korea, Japan, China, eastern Mongolia, and southeast Russia. Many different cultivars of this maple have been selected and they are grown worldwide for their large variety of attractive forms, leaf shapes, and spectacular colors.

References

  1. Barstow, M.; Crowley, D.; Rivers, M.C. (2017). "Acer saccharum". IUCN Red List of Threatened Species . 2017: e.T193863A2287314. doi: 10.2305/IUCN.UK.2017-3.RLTS.T193863A2287314.en . Retrieved 2022-11-06.
  2. "Acer saccharum Marshall — The Plant List". www.theplantlist.org.
  3. "Acer saccharum". Germplasm Resources Information Network . Agricultural Research Service, United States Department of Agriculture.
  4. "Sugar Maple Tree Facts: Sugar Maple Tree Growing Information". gardeningknowhow.com. 28 December 2015. Retrieved 2017-06-29.
  5. Meier, Eric. "Hard Maple". The Wood Database. Retrieved 2020-12-11.
  6. M.M. Grandtner (8 April 2005). Elsevier's Dictionary of Trees: Volume 1: North America. Elsevier. pp. 24–. ISBN   978-0-08-046018-5.
  7. Michigan State Horticultural Society (1900). Annual Report. Michigan State Horticultural Society. pp. 283–.
  8. 1 2 "Acer saccharum". Northern Ontario Plant Database.
  9. "Acer saccharum". Oklahoma Biological Survey. Archived from the original on 2007-11-09. Retrieved 2007-11-24.
  10. "GSMNP tall trees". Nativetreesociety.org. Retrieved 2011-03-03.
  11. Lawrence O. Copeland; M. B. McDonald (2001). Principles of seed science and technology. Springer. ISBN   978-0-7923-7322-3.
  12. "Acer grandidentatum | Landscape Plants | Oregon State University". landscapeplants.oregonstate.edu. Retrieved 2024-08-17.
  13. "Acer grandidentatum". www.fs.usda.gov.
  14. "Acer barbatum Michx". www.srs.fs.usda.gov. Retrieved 2024-08-17.
  15. "Lady Bird Johnson Wildflower Center - The University of Texas at Austin". www.wildflower.org. Retrieved 2024-08-17.
  16. "Norway Maple – New York Invasive Species Information" . Retrieved 2020-05-26.
  17. "Invasive Species Identification Sheet - Norway Maple". Natural Resources Conservation Service Connecticut. Archived from the original on 2021-03-08. Retrieved 2020-05-26.
  18. Godman, Richard M.; Yawney, Harry W.; Tubbs, Carl H. (1990). "Acer saccharum". In Burns, Russell M.; Honkala, Barbara H. (eds.). Hardwoods. Silvics of North America. Vol. 2. Washington, D.C.: United States Forest Service (USFS), United States Department of Agriculture (USDA) via Southern Research Station.
  19. Emerman, Steven H.; Dawson, Todd E. (1996). "Hydraulic lift and its influence on the water content of the rhizosphere: an example from sugar maple, Acer saccharum". Oecologia. 108 (2): 273–278. Bibcode:1996Oecol.108..273E. doi:10.1007/BF00334651. PMID   28307839. S2CID   38275842.
  20. Halama, Marek (January 2011). "First record of the rare species Pholiota squarrosoides (Agaricales, Strophariaceae) in southwestern Poland". Polish Botanical Journal. Retrieved 2019-08-10.
  21. "Sugar Maple Faces Extinction Threat". The New York Times. 7 December 1986. Retrieved 2018-04-11.
  22. Siek, Stephanie V. "Sugar Maples Fall Victim to Road Salt". The Boston Globe. Retrieved 2018-04-11.
  23. 1 2 Heilingmann, Randall B. "Hobby Maple Syrup Production (F-36-02)". Ohio State University. Archived from the original on 2002-09-17.
  24. "Sugar Maple: Nebraska Forest Service" (PDF). Nebraska Forest Service. Retrieved 2019-02-01.
  25. Elias, Thomas S.; Dykeman, Peter A. (2009) [1982]. Edible Wild Plants: A North American Field Guide to Over 200 Natural Foods. New York: Sterling Publishing. pp. 125–26. ISBN   978-1-4027-6715-9. OCLC   244766414.
  26. Angier, Bradford (1974). Field Guide to Edible Wild Plants. Harrisburg, PA: Stackpole Books. p. 135. ISBN   0-8117-0616-8. OCLC   799792.
  27. Daniel L. Cassens. "Hard or sugar maple" (PDF). Purdue University:Purdue Extension.
  28. 1 2 "Sugar Maple Plant Guide" (PDF). United States Department of Agriculture . Retrieved 2018-04-11.
  29. Kaufman, David (8 October 2020). "Lenny Kravitz Designs a Showstopping Piano for Steinway & Sons". Architectural Digest.
  30. "Auburn University Entomology and Plant Pathology | Greenstriped Mapleworm". Auburn University Entomology and Plant Pathology. Retrieved 2017-11-14.
  31. "3.1.2: Medium Deciduous Trees — Acer saccharum 'Caddo'". Putting Down Roots: Landscape Guidelines for the Selection, Care, and Maintenance of Trees in Central Oklahoma. Archived from the original on 2012-07-20 via okPLANTtrees. Fortunately for Oklahoma, a subspecies (believed to be an ecotype) of the Sugar Maple was discovered in the southwest part of the state that is specifically adapted to our hot summers and drying winds. Putting Down Roots: Landscape Guidelines for the Selection, Care, and Maintenance of Trees in Central Oklahoma at the Wayback Machine (archived 2012-11-02)
  32. Tantaquidgeon, Gladys 1972 Folk Medicine of the Delaware and Related Algonkian Indians. Harrisburg. Pennsylvania Historical Commission Anthropological Papers No. 3 (p. 69, 128)
  33. "Sugar Maple (Acer saccharum) - Champion Tree, National Forests, Massachusetts". americanforests.org. 15 September 2016. Archived from the original on 2017-01-31. Retrieved 2017-01-18.
  34. "Sugar Maple (Acer saccharum) - Champion Tree, National Forests, Connecticut". americanforests.org. 15 September 2016. Archived from the original on 2017-01-31. Retrieved 2017-01-18.

Further reading