Well Winterhorse, I don't really know much about Natalie Merchant but I just looked her up and found that when she left the band 10,000 Maniacs in 1992 she was replaced by Mary Ramsay.
Now the afore-mentioned Maniacs and Mary Ramsay sang "Wildwood Flower" but it is not on any of Natalie Merchant's albums (not that I can find anyway!!) The site I found this information on is as follows......
http://search.yahoo.com/bin/search?p=natalie+merchant

Sorry if I'm telling you what you already know...

best wishes, Yvonne