Original: In some middle-eastern countries, Marjoram is synonymous with Oregano, and there the names Sweet Marjoram and Knotted Marjoram are used to distinguish it from other plants of the genus Origanum.
Simplified: In some middle-eastern countries, Marjoram is synonymous with Oregano, and there the names Sweet Marjoram and Knotted Marjoram are used to distinguish it from other plants.