Melia azederach vs Persian lilac

Melia azederach

Persian lilac

noun
  • Syringa × persica, a shrub in the olive family (Oleaceae) 

  • Melia azedarach, a tree in the mahogany family (Meliaceae) 

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