endive vs horseweed

endive

noun
  • A leafy salad vegetable, Cichorium endivia, which is often confused with common chicory (Cichorium intybus). 

horseweed

noun
  • A plant of the species Cichorium intybus 

  • Any of various flowering plants of the genus Conyza. 

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