Red Willow

The Red Willow tree was a tree in the Frontier in an alternate reality. Its bark could be brewed into tea which would give those who drank it special powers.

Ratonhnhaké:ton climbed the Red Willow three times, once in The Infamy, where he gained the Alpha of the Pack and the Power of the Wolf abilities, once in The Betrayal, where he gained the Power of the Eagle, and once more in The Redemption, where he gained the Power of the Bear. Before he gained the powers, he visited a Sky World and connected with each spirit animal.

Reference

 * The Tyranny of King Washington