winterberry vs winterberry holly

winterberry

noun
  • A species of holly native to the United States and Canada and producing red berries, Ilex verticillata. 

  • The fruit of this plant. 

winterberry holly

noun
  • American winterberry, Ilex verticillata. 

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