bellwort vs merrybell

bellwort

noun
  • Any of several perennial plants, of the genus Uvularia, that have yellow, bell-shaped flowers. 

  • Any of various plants in the Campanulaceae family. 

merrybell

noun
  • Synonym of bellwort (“plant of genus Uvularia”) 

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