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The slippery elm (Ulmus rubra) is a large, deciduous tree that is native to North American from Texas to Manitoba, and from Florida to Quebec. When growing in well-drained soils, it can reach a height of 60 feet (20 meters). The inner bark of the branches is collected in spring for medicinal used. Slippery elm bark added to hot water has a slippery and mucilaginous consistency. Native Americans used soaked slippery elm bark as a natural bandage, allowing to dry over wounds. Many tribes also wrapped slippery elm around stored food to prevent spoilage. Slippery elm also served as a food during famine and for making porridge for small children and elderly persons.