bellflower vs wild oats

bellflower

noun
  • Any flowering plant in genus Uvularia. 

  • A flower of one of these plants, which is shaped like a bell. 

  • Any flowering plants in the genus Campanula. 

  • Flowering plants in the genera, Campanulastrum, Codonopsis, or Platycodon, in the family Campanulaceae. 

wild oats

noun
  • Species of Uvularia, the bellworts. 

  • Species of Aegilops, goatgrass. 

  • Oats of non-cultivated species of Avena, a genus of grasses. 

  • Chasmanthium latifolium, a grass, Indian woodoats 

How often have the words bellflower and wild oats occurred in a corpus of books? (source: Google Ngram Viewer )