Genus Pithecellobium is a large group of tropical trees and shrubs that consists of various species. While it is commonly known as Pithecellobium, it also has several synonyms including Inga and Mimosa. Inga is a widely used synonym for Genus Pithecellobium, and it includes several popular species like Inga stipularis and Inga edulis. Mimosa is another synonym for Genus Pithecellobium, and it includes the popular species Mimosa pudica, also known as the "touch-me-not" plant. Other common synonyms for Genus Pithecellobium include Adenanthera, Archidendropsis, and Enterolobium. Despite having different names, all of these species under the Genus Pithecellobium share common characteristics such as their tropical origins and their nitrogen-fixing capabilities.