Sugar Maple

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{{Taxobox | color = lightgreen | name = Sugar Maple | status = Conservation status: Secure | image = SugarMaple.jpg | image_width = 200px | image_caption = A farm with a Sugar Maple
in the front yard | regnum = Plantae | divisio = Magnoliophyta | classis = Magnoliopsida | ordo = Sapindales | familia = Aceraceae | genus = Acer | species = A. saccharum | binomial = Acer saccharum | binomial_authority = Marshall }}

The Sugar Maple Acer saccharum is a prominent tree in the hardwood forests of eastern North America. It is the largest American maple, reaching heights of 30-37 m tall.

Image:Sugar-maple-leaves.jpg The leaves are deciduous, 8-15 cm long and equally wide with five palmate lobes. 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 through orange to fluorescent red-orange.

The flowers are in corymbs of 5-10 together, yellow-green and without petals; flowering occurs in early spring after 30-55 growing degree days. The fruit is a double samara with two winged seeds, the seeds are globose, 7-10 mm diameter, the wing 2-3 cm long.

This tree is closely related to the Black Maple which is sometimes included in this species but sometimes separated as Acer nigrum. In some parts of Eastern North America (particularly more urbanized areas), the Sugar Maple is being displaced by the Norway Maple, which has similar leaves and habit, but can be differentiated by the white sap in the petiole; the Sugar Maple has clear sap. The Norway Maple is considerably more tolerant of urban conditions than the Sugar Maple, making it a natural replacement in those areas heavily disturbed by human activities.

1 Cultivation and uses
2 Cultivars
3 See also
4 References

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Cultivation and uses

Sugar Maple, and also Black Maple, are superb sources of sap for making maple syrup, with the Black Maple being regarded as slightly better. Almost all maples can be used as a sap source for maple syrup, but none of the others are as good as these two.

The wood is one of the hardest of the maples, and is prized for furniture and flooring. Bowling alleys and bowling pins are both commonly manufactured from sugar maple. A special type of maple, "birdseye maple" with wavy grain, is especially valued.

The Sugar Maple is a favorite street and garden tree, because it is easy to propagate and transplant, is fairly fast-growing, and has beautiful fall color; however, its intolerance of pollution and compacted soils common to inner city conditions make it a frequent victim of maple decline. It also has some of the most dense shade to be found in shade trees. 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 Maple can grow well on sandy soil which does not become excessively dry. Poorly drained areas are unsuitable and the species is especially short-lived on flood-prone clay flats. Its salt tolerance is low. Acid rain and soil acidification are believed to be contributing factors to maple decline.

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