bindi vs knapweed

bindi

noun
  • Any of a various plants of the genus Sclerolaena. 

  • Any of a number of plants of the genus Calotis which have small burrs with fine barbed awns. 

  • The common lawn weed, Soliva sessilis, introduced to Australia from South America. 

  • Makeup or jewellery worn in imitation of such a dot. 

  • A seed of this plant, having small sharp spines which stick painfully into bare feet. 

  • The “holy dot” traditionally worn on the forehead of Hindu women. 

knapweed

noun
  • Any of various common weeds of the genus Centaurea 

  • especially Centaurea nigra. 

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