great mullein vs ocotillo

great mullein

noun
  • A common herb of Europe and neighboring Africa and Asia, but widely naturalized elsewhere, Verbascum thapsus, having a flannel-like texture from course plant hairs and a tall, straight flower stalk. 

ocotillo

noun
  • Any of various succulent plants, not closely related to the cactus, in genus Fouquieria, especially Fouquieria splendens, living in Central America or the southwest United States. 

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