Hierochloe odorata or Anthoxanthum nitens, also known as sweet grass, buffalo grass, bison grass, holy grass (UK), manna grass, Mary's grass, seneca grass, sweetgrass, or vanilla grass, is an aromatic herb which grows in northern Eurasia and in North America. It is used in herbal medicine and in the production of distilled beverages (e.g., ubrwka, Wisent). It owes its distinctive sweet scent to the presence of coumarin. Very hardy perennial. Native to North America as well as Europe. Grows to about 60 centimeter (24 inches) in height, leaves grow 60 centimeter (24 inches) long by late summer. Bases of leaves, just below soil surface are broad and white, without hairs, underside of leaves are shiny, without hairs.