bee balm vs mountain mint

bee balm

noun
  • Other species in the genus Monarda. 

  • The aromatic plant Monarda didyma or bergamot, native to North America. 

mountain mint

noun
  • Any of several plants in the genus Monardella, native to western North America 

  • A European herb, Clinopodium nepeta, sometimes used as a seasoning. 

  • Any plant of the genus Pycnanthemum in the mint family. 

How often have the words bee balm and mountain mint occurred in a corpus of books? (source: Google Ngram Viewer )