bindweed vs convolvulus

bindweed

noun
  • true bindweed (Convolvulus). 

  • slender bindweed (Polymeria calycina). 

  • bittersweet nightshade, blue bindweed (Solanum dulcamara). 

  • false bindweed (Calystegia). 

  • black bindweed (Fallopia convolvulus). 

convolvulus

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

  • A species of hawkmoth, Agrius convolvuli. 

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