Barberry is a thorny shrub that can grow up to ten feet tall. The leaves are leather-like and the flowers are yellow. In the fall the plant will be found with red berries. Barberry is called Oregon Grape in North America, but the Europeans introduced it, and the Native Americans used a mixture of the bitter root for loss of appetite and other things. The ancient Egyptians took macerated barberries with fennel seed to make a drink used for fevers.
Oregon Grape - Herbal Encyclopedia, http://www.cloverleaffarmherbs.com/oregon-grape/ (accessed March 10, 2017).