noon-flower vs noonflower

noon-flower

noun
  • Disphyma crassifolium subsp. clavellatum 

noonflower

noun
  • Flowers of the genus Bauhinia. 

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

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

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