Oak bark (Quercus alba) comes from trees of the Fagaceae family, typically white oak varieties native to North America. It’s derived from the inner bark and round growths known as galls that form on ...

Cramp bark (Viburnum opulus) — also known as guelder rose, highbush cranberry, and snowball tree — is a tall, flowering shrub with red berries and clusters of white flowers. Native to Europe, it also ...