California pitcher plant vs Jack-in-the-pulpit

California pitcher plant

noun

  • The cobra lily, Darlingtonia californica. 

Jack-in-the-pulpit

noun

  • Cat's cradle. 

  • Any plant in the genus Arisaema. 

  • A woodland plant of northern Europe, Arum maculatum. 

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

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