MORPHOLOGIC AND CYTOTAXONOMIC INVESTIGATIONS ON SOME TAXA OF HELLEBORUS SECT. HELLEBORUS IN THE FRIULI-VENEZIA GIULIA REGION (NORTHEASTERN ITALY) AND ISTRIA On the basis of morphometric, histoanatomic and cytotaxonomic analyses, the populations of Helleborus of the Trieste Karst region (North-Eastern Italy) and Istria with smaller floral diameter (4.4-4.8 cm), currently treated as H. multifidus subsp. istriacus, are here included into the H. odorus complex.
