Botanical Name: Origanum vulgare Origin: Turkey Description: Oil of Oregano is the concentrated essence, or essential oil, of wild oregano. The plants botanical name is Originum vulgare, and it is known as the true Oregano species. It takes approximately 100 pounds of Oregano leaves to make a single pound of the volatile oregano oil. . For external use, Do not use Oregano essential oil if you are pregnant or nursing. For External use only, use well diluted .