black alder vs pocan

black alder

noun
  • American winterberry, Ilex verticillata. 

  • Wood or other product of the tree. 

  • A tree (Alnus glutinosa), of many practical uses, growing in moist conditions in Europe. 

pocan

noun
  • The poke, Phytolacca americana (formerly Phytolacca decandra). 

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