hawthorn vs noonflower

hawthorn

noun
  • Any of various shrubs and small trees of the genus Crataegus having small, apple-like fruits and thorny branches 

noonflower

noun
  • Flowers of the family Aizoaceae, especially those of the genus Carpobrotus. 

  • Flowers of the genus Bauhinia. 

  • Tragopogon, a type of aster that closes at midday. 

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