Trema is a genus of flowering plants in the family Cannabaceae. It includes several species commonly known as trema trees or shrubs, which are found in tropical and subtropical regions around the world. These plants are characterized by their simple leaves and small, greenish flowers that grow in clusters. Trema species are often used in traditional medicine and can provide valuable timber. They are also important for soil conservation and can help prevent erosion due to their extensive root systems. Some species are known for their fast growth, making them suitable for reforestation efforts.