orach vs saltbush

orach

noun
  • or Atriplex patula, found in dry habitats, that have edible leaves resembling spinach. 

  • especially Atriplex hortensis 

saltbush

noun
  • Any of the genus Atriplex of plants, especially Atriplex hortensis or Atriplex patula, found in dry habitats, that have edible leaves resembling spinach, including many desert and seashore plants and halophytes. 

  • Sarcobatus vermiculatus (black greasewood, greasewood, seepwood) 

  • Baccharis halimifolia 

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