Acer is the scientific name for the popular genus of trees, the maples. Maple trees can grow to be pretty large. Their wood, is hard, beautiful, strong, and used in furniture, interior woodwork, and in many other things. The fruit of the maple tree is a seed with a "wing" on it. These are popularly known as "Helicopters", "Whirligigs", etc. These trees are hardwood trees and are deciduous. A maple leaf is featured on the country flag for Canada.