The Collaborative International Dictionary of English v.0.48:

Balsamorhiza \Balsamorhiza\ n.
   genus of coarse West American herbs with large roots
   containing an aromatic balsam.

   Syn: genus Balsamorhiza.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Balsamorhiza
    n 1: genus of coarse western American herbs with large roots
         containing an aromatic balsam [syn: Balsamorhiza, genus
         Balsamorhiza]