How to pronounce “poplar tree” in English

So what's a poplar tree, sir?

Anybody here know what a poplar tree is?

And each year, this little poplar tree would blossom, and it would grow.

This is a Lombardy poplar tree, tall skinny ones.

Few of us in this room would have much of any interest in what is a poplar tree if it weren't for the fact that there was a single poplar