artemisia vs mugwort

artemisia

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

mugwort

noun
  • Artemisia vulgaris, traditionally used medicinally. 

  • Any of several aromatic plants of the genus Artemisia native to Europe and Asia. 

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