hypanthium vs thalamus

hypanthium

noun
  • The bowl-shaped part of a flower on which the sepals, petals, and stamens are borne 

thalamus

noun
  • The receptacle of a flower; a torus. 

  • A thallus. 

  • Either of two large, ovoid structures of grey matter within the forebrain that relay sensory impulses to the cerebral cortex. 

  • An inner room or nuptial chamber. 

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