Source : Webster's Revised Unabridged Dictionary (1913)

Congener \Con"ge*ner\ (?; 277), n. [From L. congener. See
   {Congenerous}.]
   A thing of the same genus, species, or kind; a thing allied
   in nature, character, or action.

         The cherry tree has been often grafted on the laurel,
         to which it is a congener.               --P. Miller.

         Our elk is more polygamous in his habits than any other
         deer except his congener, the red deer of Europe.
                                                  --Caton.

Source : WordNet®

congener
     n : an animal or plant that bears a relationship to another (as
         related by common descent or by membership in the same
         genus) [syn: {relative}, {congenator}]