artemisia vs sagebrush

artemisia

noun
  • Any of many aromatic flowering plants of the genus Artemisia, including wormwood, sagebrush, and tarragon, often used as traditional medicine and flavouring. 

sagebrush

noun
  • Any of several North American aromatic shrubs of the genus Artemisia, having silvery-grey, green leaves. 

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