red nightshade vs woolly nightshade

red nightshade

noun

  • Solanum villosum 

  • Phytolacca americana syn. Phytolacca decandra 

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 red nightshade and woolly nightshade occurred in a corpus of books? (source: Google Ngram Viewer )