Christmas berry vs spiceberry

Christmas berry

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

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

spiceberry

noun
  • A compact flowering plant, Ardisia crenata, native to East Asia. 

  • Its fruit, a glossy, bright red drupe. 

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