inkberry vs pokeberry

inkberry

noun
  • Any plant of the genus Phytolacca, especially Phytolacca americana, the pokeweed. 

  • Ilex verticillata, American winterberry 

  • Scaevola plumieri, a fan flower 

  • Ilex glabra (winterberry, gallberry) 

pokeberry

noun
  • Synonym of pokeweed (the plant Phytolacca americana or its dark red or purple fruit). 

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