Jack-in-the-pulpit vs pitcher plant

Jack-in-the-pulpit

noun
  • A plant in the northeastern North America, Arisaema triphyllum. 

  • Any plant in the genus Arisaema. 

  • Cat's cradle. 

  • A woodland plant of northern Europe, Arum maculatum. 

pitcher plant

noun
  • Any of various insectivorous plants of the genera Sarracenia, Darlingtonia, Heliamphora, Nepenthes and Cephalotus that have pitcher-like leaves or parts of leaves with slippery sides that attract and trap insects. 

How often have the words Jack-in-the-pulpit and pitcher plant occurred in a corpus of books? (source: Google Ngram Viewer )