The Collaborative International Dictionary of English v.0.48:

Poly-mountain \Po`ly-moun"tain\, n. (Bot.)
   (a) Same as Poly, n.
   (b) The closely related Teucrium montanum, formerly called
       Polium montanum, a plant of Southern Europe.
   (c) The Bartsia alpina, a low purple-flowered herb of
       Europe.
       [1913 Webster]