The Bluegrass Guitar site features Wildwood Flower: http://www.bluegrassguitar.com/studytune.html

They start with the basic melody, progress through Carter-style like Maybelle played it, then venture off into a cross-picking version Clarence White did.

You'll have to download the Scorch application (free and handy) but you'll have the sheet music (not tab) for the way the tune is arranged on the site.

Wendy