devil's nettle vs sanguinary

devil's nettle

noun
  • Achillea millefolium or common yarrow, a flowering plant native to temperate regions of the Northern Hemisphere. 

  • Dendrocnide sinuata (synonym: Laportea crenulata), a species of nettle in the family Urticaceae found in Australia and South Asia. 

sanguinary

noun
  • The plant common yarrow, or herba sanguinaria (Achillea millefolium). 

  • A bloodthirsty person. 

adj
  • Eager to shed blood; bloodthirsty. 

  • Involving bloodshed. 

  • Consisting of, covered with, or similar in appearance to blood. 

How often have the words devil's nettle and sanguinary occurred in a corpus of books? (source: Google Ngram Viewer )