black cap raspberry vs black raspberry

black cap raspberry

black raspberry

noun
  • The fruit of any of these species. 

  • A plant belonging to either of two closely related species, Rubus leucodermis or Rubus occidentalis, both native to North America. 

  • Rubus coreanus, native to Korea, Japan, and China 

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