azedarach vs syringa

azedarach

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

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

syringa

noun
  • Any of several flowering plants, of the genus Syringa, such as the lilacs. 

  • Hence any of several flowering plants of the genus Philadelphus, such as now in the Western United States Philadelphus lewisii. 

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