hairy nightshade vs woolly nightshade

hairy nightshade

noun

  • Solanum villosum 

  • Solanum physalifolium 

  • Solanum sarrachoides 

woolly nightshade

noun

  • Solanum villosum, a plant native to the Mediterranean. 

  • Solanum mauritianum, a pest plant native to South America. 

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