pokeweed vs spiceberry

pokeweed

noun
  • A poisonous North American plant, Phytolacca americana, with reddish stems, broad leaves, clusters of white flowers, and dark purple berries. 

spiceberry

noun
  • Its fruit, a glossy, bright red drupe. 

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

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