jimson vs thorn apple

jimson

noun
  • jimsonweed 

thorn apple

noun
  • Jimsonweed (Datura stramonium), an annual plant having white flowers and prickly capsules. 

  • Datura spp., especially 

  • Crataegus spp. 

  • Solanum incanum, native to Africa and Asia 

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