Persian lilac vs white cedar

Persian lilac

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

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

white cedar

noun
  • The chinaberry, Melia azedarach. 

  • The Atlantic white cypress, Chamaecyparis thyoides. 

  • The Mexican white cedar, Cupressus lusitanica 

  • An evergreen coniferous tree of the family Cupressaceae, native to the northeastern US and southeastern Canada, Thuja occidentalis. 

  • Tabebuia heterophylla, of the Caribbean and South America. 

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