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Hierochloe odorata or Anthoxanthum nitens, also known as sweet grass, holy grass (UK), manna grass, Mary’s grass, seneca grass, sweetgrass, or vanilla grass, is an aromatic herb native to northern Eurasia and North America. In Poland it is known as bison grass. It is used in herbal medicine and in the production of distilled beverages. It owes its distinctive sweet scent to the presence of coumarin.