Riella macrocarpa was described as R. helicophylla var. macrocarpa by Allorge in 1929.
Later, this variety has not been used further and has not been treated correctly in
the checklists. The species was separated and raised to the species rank by Segarra-Moragues
et al. in 2022. Riella macrocarpa is known mainly in the western part of the Mediterranean
Basin. The only record from the eastern part is from Cyprus. In the Balkan Peninsula
only Riella notarisii has been reported so far from Croatia and Greece. Riella macrocarpa
was found in Albania (Narta area), which means an extension of the distribution of
this species to the eastern Mediterranean region. Its occurrence details in the Narta
area and some notes on habitats are presented in this paper.
