Genus Celtis, commonly known as hackberry, is a genus of about 70-80 species of trees and shrubs that belong to the elm family, Ulmaceae. There are many synonyms for the word "Genus Celtis," but some of the most commonly used ones include Celtis, nettle tree, sugarberry, and common hackberry. These trees are native to different parts of the world, including Asia, North America, Africa, and Europe. They are prized for their hardiness and adaptability to different types of soil and climates. They provide food and shelter for various species of birds and wildlife, making them an essential part of many ecosystems. Overall, the genus Celtis is an important group of trees that deserves further attention and protection.