black raspberry vs salmonberry

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 

salmonberry

noun
  • The fruit from this bush, similar in appearance and texture to the blackberry and raspberry. 

  • A bush, Rubus spectabilis, found on the Pacific coast of North America. 

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