Beta vulgaris rapacea var. altissima vs sugar beet

Beta vulgaris rapacea var. altissima

sugar beet

noun

  • A type of beet whose root contains a high concentration of sucrose. 

  • darling; sweetheart 

How often have the words Beta vulgaris rapacea var. altissima and sugar beet occurred in a corpus of books? (source: Google Ngram Viewer )