Amygdalus communis amara vs bitter almond

Amygdalus communis amara

bitter almond

noun
  • The seed of this tree, which is unpalatably bitter and bears many times the cyanide of the sweet almond. 

  • A tree of the species Brabejum stellatifolium (order Proteales). 

  • A tree of the species Prunus amygdalus (order Rosales). 

How often have the words Amygdalus communis amara and bitter almond occurred in a corpus of books? (source: Google Ngram Viewer )