| Norway maple |
USDA PLANTS Symbol: ACPL USDA ARS GRIN: 1209 ITIS: 28755 NAPIS: PACABBF |
| Acer platanoides L. | |
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Taxonomic Rank: Magnoliopsida: Sapindales: Aceraceae |
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Norway maple is a deciduous tree that grows 40-60 ft. (12.2-18.3 m) tall. The opposite leaves are palmately lobed with 5-7 lobes. The margins are marked with a few large teeth. Flowering occurs in the early spring before the leaves emerge. The flowers are inconspicuous and develop into large double samaras that mature in the late summer. Norway maple is very similar to sugar maple but can be distinguished by the fruit, sap and bark. The angle of seed wings of Norway maple is approximately 180 degrees, while the angle between the seed wings of sugar maple is near 120 degrees. Broken leaf petioles of Norway maple ooze white sap while the sap of sugar maple is clear. Norway maple bark is regularly grooved, and sugar maple bark has irregular plates. Norway maple has invaded forested ecosystems throughout the northeastern United States and parts of the Pacific Northwest. Once established into a forest, it has the ability to shade out the native understory and out-compete the native tree species. Norway maple is native to Europe and was first introduced into the United States in 1756. It has been, and continues to be, widely sold as an ornamental. |
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Identification, Biology, Control and Management Resources
- Weed of the Week - USDA Forest Service
- Invasive Plant Atlas of New England - University of Connecticut
- Plant Invaders of Mid-Atlantic Natural Areas - National Park Service and U.S. Fish and Wildlife Service
- Fact Sheet - Pennsylvania Dept. of Conservation and Natural Resources
| Selected Images from Invasive.org | View All Images at Invasive.org |
 Foliage; Jan Samanek, State Phytosanitary Administration, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Paul Wray, Iowa State University, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Joseph O'Brien, USDA Forest Service, Bugwood.org Additional Resolutions & Image Usage |
 Bark; Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Bark; Paul Wray, Iowa State University, Bugwood.org Additional Resolutions & Image Usage |
 Diagram or Graphic; 1. Branchlet with corymb, terminating developing young shoots (a - e) with deciduous (typically green) transitional leaves at their base (k). - 2. Branchlet with mature leaves and ripe fruits (double samaras). Stalk exuding a milky sap when broken. Wings of the samaras spread perpendicular to the pedicels (»horizontally spreading«), with conspicuously flat nutlets. - 3. Seedling with cotyledons (c) and first pair of ordinary leaves. - 4. Winter-branchlet; buds are reddish-brown, glossy, terminal bud is larger. Leaf-scars are opposite, horseshoe- or heart-shaped and connected extreme laterally. After Hempel & Wilhelm, 1889. Photos and explanations from the book: Zelimir Borzan. "Tree and Shrub Names in Latin, Croatian, English, and German, with synonyms", University of Zagreb, 2001. Zelimir Borzan, University of Zagreb, Bugwood.org Additional Resolutions & Image Usage |
 Twig(s)/Shoot(s); Bill Cook, Michigan State University, Bugwood.org Additional Resolutions & Image Usage |
 Twig(s)/Shoot(s); Buds Paul Wray, Iowa State University, Bugwood.org Additional Resolutions & Image Usage |
 Fruit(s); Paul Wray, Iowa State University, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Jan Samanek, State Phytosanitary Administration, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); with new foliage Jan Samanek, State Phytosanitary Administration, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Jan Samanek, State Phytosanitary Administration, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); The Dow Gardens Archive, Dow Gardens, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Bill Cook, Michigan State University, Bugwood.org Additional Resolutions & Image Usage |
 Fruit(s); Paul Wray, Iowa State University, Bugwood.org Additional Resolutions & Image Usage |
 Fruit(s); Bill Cook, Michigan State University, Bugwood.org Additional Resolutions & Image Usage |
 Seed(s); Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org Additional Resolutions & Image Usage |
 Tree(s); Richard Old, XID Services, Inc., Bugwood.org Additional Resolutions & Image Usage |
 Tree(s); Jan Samanek, State Phytosanitary Administration, Bugwood.org Additional Resolutions & Image Usage |
 Tree(s); with fall color Jan Samanek, State Phytosanitary Administration, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; with fall color Jan Samanek, State Phytosanitary Administration, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; with fall color Jan Samanek, State Phytosanitary Administration, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
Taxonomic References:
- USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Invasive Listing Sources:
- City of Ann Arbor Michigan Parks and Recreation
- Commonwealth of Pennsylvania, Department of Conservation and Natural Resources, 1994.
- Connecticut Department of Environmental Protection
- Connecticut Invasive Plant Working Group
- Delaware Natural Resources and Environmental Control, 2004
- Eric Ulaszek, U.S. Forest Service, Midewin National Tallgrass Prairie, Illinois
- Faith Campbell, 1998. Plants that Hog the Garden: Invasive Plants in the United States. Fine Gardening Online
- Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.
- Indiana Native Plant and Wildflower Society
- Invasive Plant Council of New York State
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Maryland Cooperative Extension Service. 2003. Invasive Plant Control in Maryland. Home and Garden Information Center, Home and Garden Mimeo HG88. 4 pp.
- Maryland Department of Natural Resources, 1994
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Native Plant Society of Oregon, 2002
- New Hampshire Invasive Species Committee. 2005. Guide to Invasive Upland Plant Species in New Hampshire. New Hampshire Department of Agriculture, Markets and Food Plant Industry Division and New Hampshire Invasive Species Committee.
- New Jersey Department of Agriculture, Division of Plant Industry, 2004
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- Pennypack Ecological Restoration Trust, Pennsylvania.
- Reichard, Sarah. 1994. Assessing the potential of invasiveness in woody plants introduced in North America. University of Washington Ph.D. dissertation.
- Tatyana Livschultz, Pennsylvania survey of invasive plants,
- Virginia Department of Conservation and Recreation, 1999.
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Connecticut Noxious Weeds
- Massachusetts Noxious Weeds
- New Hampshire Noxious Weeds
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