inflorescence vs panicle

inflorescence

noun
  • An instance of a plant beginning to flower. 

  • Flower cluster; a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. 

panicle

noun
  • A compound raceme. 

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