Mitchella repens vs partridgeberry

Mitchella repens

partridgeberry

noun
  • lingonberry, Vaccinium vitis-idaea 

  • teaberry, Gaultheria procumbens 

  • The berry of such a plant. 

  • squaw vine, Mitchella repens 

How often have the words Mitchella repens and partridgeberry occurred in a corpus of books? (source: Google Ngram Viewer )