What are the words to O Tannenbaum in English?

There are several English translations of "O Tannenbaum," and they vary slightly in wording and rhythm. Here's a common one:

O Christmas tree, O Christmas tree,

How lovely are your branches!

You're green in summer, green in winter,

And always bring us gladness.

O Christmas tree, O Christmas tree,

How lovely are your branches!

Some translations add verses, but this is the most common and widely recognized.