common alder vs winterberry

common alder

noun
  • A tree native to much of Europe and neighboring Africa and Asia (Alnus glutinosa). 

winterberry

noun
  • The fruit of this plant. 

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

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