den*drol"o*gist

from The Collaborative International Dictionary of English v.0.48

Dendrologist \Den*drol"o*gist\, n.
   One versed in the natural history of trees.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

dendrology \den*drol"o*gy\, n. [Gr. de`ndron tree + -logy: cf.
   F. dendrologie.]
   1. the branch of botany studying trees and shrubs; the
      natural history of trees.
      [PJC]

   2. A discourse or treatise on trees.
      [1913 Webster] -- {den`dro*log"ic*al}, a. --
      {den`dro*log"ic}, a. -- {den*drol"o*gist}, a.
      [PJC]