Cecropia obtusifolia aka the Trumpet Tree

[My 2 cents]

I challenge you to build a fire with it using nothing else. It doesn't burn. You can get it to burn if it is very dry and you add it to a fire that was made of other wood. Don't add too much though or you will put the fire out. Seriously.

I figured the fire retardant qualities should make it useful for something but I've never taken it to the next step.