Ilex verticillata, a species of holly native to eastern North America in the United States and southeast Canada, from Newfoundland west to Ontario and Minnesota, and south to Alabama.
red nightshade
noun
Phytolacca americana syn. Phytolacca decandra
Solanum villosum
How often have the words American winterberry and red nightshade occurred in a corpus of books? (source: Google Ngram Viewer )