Christmas berry vs toyon

Christmas berry

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

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

toyon

noun
  • A chiefly Californian ornamental evergreen shrub (Photinia arbutifolia), syn. Heteromeles arbutifolia) of the rose family having white flowers succeeded by red berries. 

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