jimsonweed vs moonflower

jimsonweed

noun
  • Any poisonous plant of the genus Datura. 

  • A poisonous plant of the Datura stramonium species, part of the nightshade (Solanaceae) family. A hallucinogen occasionally ingested by those looking for a cheap high. 

moonflower

noun
  • Species of Datura, including Datura inoxia. 

  • Species in genus Cereus and in Hylocereus. 

  • Any of several vines of the genus Ipomoea, especially Ipomoea alba. 

  • Species of Mentzelia, including Mentzelia pumila. 

  • The corn marigold, Glebionis segetum. 

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