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["Donna &/or Kieran" <holycow@cookeville.com>]

There's Blacktwig, that one's pretty easy to come by, I don't have Lee Calhoun's book here, but isn't it similar to or identical to Paragon?  I dont think she's asking for Limbertwig, as that is a more eastern type, but it's possible.  The 3rd possibility is that she is asking for the local name of a local apple that is either now very rare or extinct.