field bindweed vs sea daffodil

field bindweed

noun
  • A common and invasive Eurasian perennial weed, Convolvulus arvensis, which has become established worldwide. 

sea daffodil

noun
  • Pancratium maritimum, a coastal plant. 

How often have the words field bindweed and sea daffodil occurred in a corpus of books? (source: Google Ngram Viewer )