chicory button vs endive

chicory button

noun
  • A plant of the species Cichorium intybus 

endive

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

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