There are dozens of birch species, all which originate in the northern hemisphere. Its sap is collected and drunk as a tonic in northern Europe and Russia. It is also used in syrup, beer and wintergreen-flavored candy.
Mindanoan gum (or rainbow eucalyptus) found in the Philippines, where the bark is used as a traditional remedy against fatigue. Image by French photographer Cedric Pollet for his book "Bark: An Intimate Look at the World’s Trees." via Brain Pickings.