mayweed vs trailing arbutus

mayweed

noun
  • A mayflower. 

  • corn chamomile, field chamomile, Anthemis arvensis. 

  • Plants of the genera Matricaria and Tripleurospermum. 

  • stinking chamomile, Anthemis cotula. 

trailing arbutus

noun
  • The mayflower, Epigaea repens, of eastern North America. 

How often have the words mayweed and trailing arbutus occurred in a corpus of books? (source: Google Ngram Viewer )