Sesleria leucocephala
Also known as Sesleriella leucocephala, this small, perennial, tufted grass has no common name. It is found in the Alps, Dolomites in Italy and the Balkans. It was growing in cracks on limestone boulders not far from the much larger species in the same genus: Sesleria caerulea (Blue Moor-grass). Sesleria caerulea perfers basic soils so perhaps Sesleria leucocephala does too but I can't confirm this or that it is an alpine grass.