celandine vs pilewort

celandine

noun
  • lesser celandine (Ficaria verna, formerly Ranunculus ficaria) 

  • Either of two not closely related flowering plants 

  • greater celandine (Chelidonium majus) 

pilewort

noun
  • Ficaria verna (formerly Ranunculus ficaria), lesser celandine, a plant in the buttercup family. 

  • Erechtites hieraciifolius, or fireweed, a plant in the aster family; 

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