Small traces of gold have been found in the leaves of Eucalyptus trees.
Eucalyptus trees, the researchers believe, are drawing gold from 35 meters below ground, then pushing it out to the leaves to reduce its poisonous effects. The actual amount of gold in each leaf is negligible: Lintern has described the particles as so small that the leaves from 500 trees over a deposit would only be enough to make a wedding ring.