English: Sources: KLAUS WERNER and FRIEDRICH EBEL; Zur Lebensgeschichte der Gattung Helleborus L. (Ranunculaceae);Flora (1994) 189, p.97-130 Walter K. Rottensteiner; Attempt of a morphological differentia tion of Helleborus species in the Northwestern Balkans; Modern Phytomorphology 9 (Suppl.): 17–33, 2016 https://web.archive.org/web/20060926204830/http://www.hellebores.org/hellebores.html
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