botany vs phytobiology

botany

noun
  • The scientific study of plants, a branch of biology. Typically those disciplines that involve the whole plant. 

  • The plant life of a geographical area; flora. 

  • The properties and life phenomena exhibited by a plant, plant type, or plant group. 

  • A botanical treatise or study, especially of a particular system of botany or that of a particular place. 

phytobiology

noun
  • The branch of biology that involves plants. 

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