Source : Webster's Revised Unabridged Dictionary (1913)

Birchen \Birch"en\ (b[~e]rch"'n), a.
   Of or relating to birch.

         He passed where Newark's stately tower Looks out from
         Yarrow's birchen bower.                  --Sir W.
                                                  Scott.

Source : WordNet®

birchen
     adj : consisting of or made of wood of the birch tree [syn: {birch},
            {birken}]