holm oak vs ilex

holm oak

noun
  • An evergreen tree, Quercus ilex, native to the Mediterranean region. 

ilex

noun
  • Any of the numerous trees or shrubs of the genus Ilex. 

  • Holm oak (Quercus ilex). 

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