Christopher Morley - Tit for Tat

I OFTEN pass a gracious tree
Whose name I can't identify,
But still I bow, in courtesy
It waves a bough, in kind reply.

I do not know your name, O tree
(Are you a hemlock or a pine?)
But why should that embarrass me?
Quite probably you don't know mine.

Christopher Morley

http://www.poemhunter.com/poem/tit-for-tat-5/