Christmas berry vs striped alder

Christmas berry

noun
  • Synonym of toyon (“plant or its berry”) (Photinia arbutifolia, syn. Heteromeles arbutifolia) 

  • Synonym of spiceberry (“plant or its berry”) 

striped alder

noun
  • American winterberry, Ilex verticillata. 

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