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Acer is a genus comprising over 115 related species of trees and shrubs primarily found in the temperate regions of the Northern Hemisphere. Many Acer species are well-known and cultivated as popular garden specimens. Notable members of the Acer genus include sycamore and maple trees. Here are some key points about Acer:

1. Diversity: The Acer genus is diverse, with various species exhibiting different characteristics. The genus is known for its deciduous trees and shrubs, and it includes both large trees and smaller ornamental varieties.
2. Geographic Distribution: Acer species are predominantly found in temperate regions of the Northern Hemisphere. They are commonly distributed in North America, Europe, and Asia.
3. Popular Garden Specimens: Many Acer species are cultivated for their ornamental value and are commonly planted in gardens and landscapes. The aesthetic appeal of their foliage, particularly during the fall when leaves often display vibrant colors, contributes to their popularity.
4. Leaf Variations: Acer species can have different types of leaves. Some species have pinnate leaves, which are characterized by leaflets arranged on either side of a central stem. An example is the box elder (Acer negundo) found in North America.
5. Maples: Maples are a prominent group within the Acer genus. Maple trees are valued for their distinctive palmate leaves, which have lobes radiating from a central point, resembling the shape of a hand. The characteristic shape of maple leaves is iconic and easily recognizable.
6. Autumn Colors: Acer trees are particularly known for the striking colors their leaves exhibit in the fall. The changing hues, including vibrant reds, oranges, and yellows, make them a highlight of autumn landscapes.
7. Symbolism: Maple leaves, in particular, hold cultural significance and are featured on the national flag of Canada. The iconic maple leaf is a symbol of Canada and is associated with the country’s natural beauty.

Overall, the Acer genus contributes significantly to horticulture and landscaping, providing a range of species with diverse characteristics and aesthetic appeal.