Interesting. The only one I ever heard sing it as Mary was the late and terribly lamented Ed McCurdy, may all blessings heap upon his line. All other versions I've heard as Flora. My favorite version is probably by Peter, Paul and Mary, on either In The Wind or Moving.

The Ed McCurdy one, though, dates back to the 40's, I think, and on the record cover there were historical notes. However, I don't have that album, Mom does, do I can't look it up for you. If any of you have that album, maybe you can chime in...