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My favourite tree evolution thing is the forests in the Galapagos being evolved from dandelion seeds blown in on the wind from South America.

Fascinating. Do you have a link to that, or the name of that species?

I heard about it on the David Attenborough's Galapagos series:

Here is a YouTube playlist, I think it was episode 3, Evolution:

Also see the wiki page mentioned in the sibling comment.