leaf node vs phyllon

leaf node

noun
  • A node, in a tree, that has no children. 

  • One of the spots upon a stem where buds and intercalary meristems occur, usually marking the end of a season's growth. 

phyllon

noun
  • A leaf, or something (flat) resembling a leaf. 

  • A specific herb which the ancient Greek Theophrastus asserted could influence the sex of a fetus. 

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