pseudanthium vs seedling

pseudanthium

noun
  • An inflorescence that looks and functions as if it were a single flower. 

seedling

noun
  • A young plant grown from seed. 

  • a tree smaller than a sapling. 

  • one grown in a nursery for transplanting. 

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