Helleborus niger L.

Native to:

Austria, Germany, Italy, Switzerland, Yugoslavia

Introduced into:

Czechoslovakia, France, New York, Sweden

POWO follows these authorities in accepting this name:

• Jonsell, B. (ed.) (2001). Flora Nordica 2: 1-430. The Bergius Foundaton.
• McLewin, W. (2019). Helleborus and the Helleborastrum problem: 1-309. Wellesley-Cambridge Press.
• Tutin, T.G. & al. (eds.) (1993). Flora Europaea ed. 2, 1: 1-581. Cambridge University Press.
• Werier, D. (2017). Catalogue of the Vascular plants of New York state. Memoirs of the Torrey Botanical Club 27: 1-542.

Kew Backbone Distributions

• Jonsell, B. (ed.) (2001). Flora Nordica 2: 1-430. The Bergius Foundaton.
• Tutin, T.G. & al. (eds.) (1993). Flora Europaea ed. 2, 1: 1-581. Cambridge University Press.
• Werier, D. (2017). Catalogue of the Vascular plants of New York state. Memoirs of the Torrey Botanical Club 27: 1-542.