apple of Sodom vs crown flower

apple of Sodom

noun
  • The mudar (Calotropis procera), a flowering plant, found from northern Africa to southeast Asia, which bears poisonous fruit. 

  • A gigantic tree supposed to have grown on the site of the destroyed cities Sodom and Gomorrah (see Genesis 18–19 in the Bible), the apples of which would turn to ash and smoke once picked. 

  • The bitter apple, colocynth, etc. (Citrullus colocynthis), a desert plant native to Asia and the Mediterranean Basin with extremely bitter flesh. 

  • The fruit of the mythical tree. 

  • The black spine nightshade or devil's apple (Solanum linnaeanum), a plant native to southern Africa that bears poisonous berries. 

  • The nipplefruit (Solanum mammosum), a plant native to South America. 

  • The names of various plants, often bearing bitter or poisonous fruit. 

  • The bitter apple, bitterball, or bitter tomato (Solanum incanum), a plant native to sub-Saharan Africa, the Middle East, and India. 

  • The Carolina horsenettle (Solanum carolinense), a plant native to North America. 

  • The forest bitterberry (Solanum anguivi), a plant native to non-arid parts of Africa. 

crown flower

noun
  • A large shrub, Calotropis gigantea, growing up to 4 meters tall, with clusters of waxy flowers that are either white or lavender in color. 

How often have the words apple of Sodom and crown flower occurred in a corpus of books? (source: Google Ngram Viewer )