The genus of maple trees is ACER, which is a four-letter word. ACER is a genus of trees and shrubs commonly known as maple. It is a member of the family Sapindaceae, which includes about 128 species in 15 genera, including both deciduous and evergreen species. The most widely distributed species is the Norway maple, which is native to Europe, Asia, and North America. Other species are native to Asia, Europe, and North America. Maple trees are popular for their attractive foliage and wood, which is used for furniture, flooring, and musical instruments.