white alder vs winterberry

white alder

noun
  • American winterberry (Ilex verticillata). 

  • Grey alder (Alnus incana) 

winterberry

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

  • The fruit of this plant. 

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