Norway Maple - Acer platanoides
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Norway maple is a deciduous tree that grows 40-60 feet tall. The opposite leaves are palmately lobed with 5-7 lobes. The margins have few large teeth. The flowers are inconspicuous and give way to large samara fruit. Norway maple is very similar to sugar maple but can be distinguished by the fruit, sap, and bark. The angle Norway maple seed wings is around 180 degrees, sugar maple’s seed wings have an angle of around 120 degrees. If you break a leaf petiole Norway maple oozes white sap whereas sugar maple oozes clear sap. Norway maple bark is regularly grooved. 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.
- Leaf: Opposite, simple, and palmately-veined, 5 to 7 lobed with long pointed "teeth", exudes milky white sap from the petiole when detached, dark green above, paler below. A purple (nearly black) leaf variety known as Crimson King is widely planted.
- Flower: Appear in early spring, before leaves; bright yellow-green in color, with male and female usually on different trees.
- Fruit: Widely divergent 2-winged samaras, 1 1/2 to 2 inches long in clusters, relatively flat seed cavity, mature in late summer and persist into the winter.
- Twig: Stout, brown with a large, turban-shaped, green to purple(fall and winter) terminal bud, large bud scales.
- Bark: Gray-brown, a bit corky, on older trees shallowly furrowed with long narrow, somewhat interlacing ridges.
- Form: Medium sized tree to 80 feet tall, usually with a dense rounded crown.
Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers