I don't recall any Tannahill songs to "The Wearing of the Green". Bouicault's song is from his play 'Arrah na Pogue', 1865, but there was an earlier version of the song that has proven elusive (the tune as "The Wearing of the Green" was published in New York in 1859). At any rate the tune was by James Oswald, and is "The Tulip" in his 'Airs for the Seasons' copyright 1747, but apparently not published until 1756. It was subsequently used for a song in a play, and from the burden of the song we get the title of it for a dance tune "Ballance a Straw". Anne Geddes Gilchrist published a note on the use of the tune in 'Southern Folklore Quarterly', noting it as the tune for the 19th century American hymn "We are coming Father Abraham". I think most of this is in the Irish tune index on my website. www.erols.com/olsonw