red nightshade vs white alder

red nightshade

noun

  • Phytolacca americana syn. Phytolacca decandra 

  • Solanum villosum 

white alder

noun

  • American winterberry (Ilex verticillata). 

  • Grey alder (Alnus incana) 

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