I was told that there are more than 250 species. Ellis wrote:

"This is all good in Oz where the tree has developed in harmony with its native conditions"

The really interesting thing is that eucalyptus became much more widespread after humans arrived. The theory is that "its native conditions" are the result of human activity, Aboriginal burning. Eucalyptus evidently used to be present in NZ until ice ages pushed their ecological range too far north for them to survive. Been reintroduced but not a problem here.

Ellis. Your earlier post reminded me of the song, "I Know an Old Lady who Swallowed a Fly". Similar things happened here.