A new hexaploid species of fine-leaved fescue from Festucasect.Festuca (Festucasilana Ardenghi, Pallanza & Foggi, sp. nov.) endemic to the Sila plateau is described. The new taxon shows morphological affinities with species of the F.marginata group from which it can be distinguished by higher ploidy, ecology, and leaf cross section anatomy. ddRADseq data suggests F.silana could be a local hexaploid descendant/derivate of the widespread diploid F.marginata. Its distribution is restricted to several localities in the Sila highlands of the Southern Apennines, Italy.

Botanic Garden University Museum System University of Pavia Via Sant'Epifanio 14 27100 Pavia Italy

Department of Biology Ecology and Earth Sciences University of Calabria Via Pietro Bucci 87030 Arcavacata di Rende Italy

Department of Botany and Zoology Faculty of Science Masaryk University Kotlářská 2 61137 Brno Czech Republic

Department of Earth and Environmental Sciences University of Pavia Via Sant'Epifanio 14 27100 Pavia Italy

National Biodiversity Future Centre 90133 Palermo Italy

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