A silver oak tree is a variety of oak tree found in Xanth.
Tall and majestic, the silver oak tree's leaves and acorns are made of silver. They are often well hidden, and can be more easily spotted from the air due to their glint. When found, careful harvesting of their leaves and replanting of their acorns can provide a steady source of money to whomever harvests it.
Donald the prospector once found one, then died while trying to return to his family. Two years later, he inhabited Bink's body as a shade and was able to deliver the message. It was located roughly 13 miles North-northeast of a millpond presumed to be near his farm. It is unknown if the tree was ever harvested.
- A Spell for Chameleon, Chapter 3