common chicory vs succory

common chicory

noun
  • Cichorium intybus, a somewhat woody perennial herbaceous plant of the dandelion family, many varieties of which are cultivated for salad leaves. 

succory

noun
  • chicory (Cichorium intybus) 

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