salmonberry vs whitebark raspberry

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. 

whitebark raspberry

noun
  • The dark purple composite fruit of this plant, similar to a raspberry. 

  • A deciduous, viny shrub (Rubus leucodermis) with a pale, whitish bark. 

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