evergreen oak vs ilex

evergreen oak

noun
  • The holm oak or ilex, Quercus ilex 

  • Used other than figuratively or idiomatically: see evergreen, oak. 

ilex

noun
  • Holm oak (Quercus ilex). 

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

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