bloodroot vs bloodwort

bloodroot

noun
  • A North American plant, Sanguinaria canadensis, of the poppy family, which has a red root and sap and a single white flower in early spring. 

bloodwort

noun
  • The plant bloodroot, Sanguinaria canadensis. 

  • Rumex sanguineus, bloody dock, wood dock, bloody-veined dock. 

  • Sanguinary, common yarrow, Achillea millefolium. 

  • Capsella bursa-pastoris, shepherd's purse. 

  • Any of the Haemodoraceae, a family of flowering plants some of whose roots contain a red dye. 

  • Various species in the genus Sanguisorba, burnet. 

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