Helleborus niger, commonly called Christmas rose or black hellebore, is an evergreen perennial flowering plant in the buttercup family, Ranunculaceae. It is one of about 20 species from the genus Hellebore. It is a poisonous cottage garden favourite because it flowers in the depths of winter.

Ranunculaceae is a family of over 2,000 known species of flowering plants in 43 genera, distributed worldwide.