Trees

232,374,405,323

(232billion 374million 405 thousand 3 hundred and twenty three.)

That figure was correct as at 1.52pm GMT Sunday 19th October 2014.

Not even close, Lordy.

At this moment on earth, there are around 61 trees per person, which makes a bit more than 400 billion trees.

If one counts an average of 50 years for a tree lifespan, it would make around 300 billion of billions of trees having lived during 380 million years.

I think Lordy misread the question and answered as though the question was "How many individual varieties."

Well, that case is even worse.

Depending on sources, it's estimated that there are 20 000 to 100 000 different species of trees.

Not counting irony tree, obviously..