convolvulus vs hedge bindweed

convolvulus

noun
  • A species of hawkmoth, Agrius convolvuli. 

  • Any of several plants, of the genus Convolvulus, found in temperate climates, having small trumpet-shaped flowers. 

hedge bindweed

noun
  • Calystegia sepium 

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