For reasons unknown, hymnary.org has it as "The great spotless bird", and ascribes it to a G. T. Browyer or Brouayer. Link.

I'm interested in the origins of the interracial stanza; I don't remember where I got it, but I included it in one of my Evergreen Hymn Sings about a decade ago. As you can see, I attributed it to Guy Smith, but I'm not sure on what authority.