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
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