Time Tree
From Tardis Wiki, the free Doctor Who reference
The Time Tree was a tree which enabled time travel. It was possible to time travel simply by plucking its seeds, which grew into other time trees. However the method of time travel was not exact. One seed could take someone back a thousand years, another ten thousand. Time Trees had an appetite for heavy metals. Their leaves were orange. (PROSE: Genocide)
They originated on the planet Hirath. (PROSE: Longest Day)
