Indian lilac vs azedarach

Indian lilac

noun
  • neem tree (Azadirachta indica) 

  • chinaberry tree (Melia azedarach) 

azedarach

noun
  • The bark of the roots of the azedarach, used as a cathartic and emetic 

  • An Asiatic tree (Melia azedarach), common in the southern United States, commonly called bead tree, chinaberry, etc. 

How often have the words Indian lilac and azedarach occurred in a corpus of books? (source: Google Ngram Viewer )