Oak tree (also known as oak or oak tree) is a general term for plants in the Fagaceae family, including species of oak, green oak, and oak, usually referring to oak plants, not a specific tree species. There are 615 species in the oak genus, of which 450 are from the oak subgenus and 188 are from the green oak subgenus. Their fruit is called acorns, and their wood is generally referred to as oak. Oak trees mostly grow in the northern hemisphere. About 200-250 species of oak trees are distributed in the Americas, and more than 300 species of oak trees grow in Asia, Europe, and northern Africa. Although China has abundant resources of more than 50 species of oak trees, most of them are distributed in hilly and mountainous areas, and there are few species of autumn leaf trees, which affects their application in landscaping. The sentence is:.