boxthorn vs spiceberry

boxthorn

noun
  • Any plant of the genus Lycium. 

spiceberry

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

  • Its fruit, a glossy, bright red drupe. 

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