Euphorbia is one of the most diverse genera in the plant kingdom with over 2000 species. The majority of euphorbias are found in tropical regions in Africa and the Americas. The most widely cultivated euphorbia is the poinsettia. Most Euphorbias are succulents. A key difference between cacti and euphorbias is the presence of leaves. Euphorbias are drought resistant like other succulent plants. Some flower while others are grown for their foliage.