Abstract
A taxonomic revision regarding the Italian and Sicilian populations of Sesleria nitida Ten., critical species of the Tyrrhenian flora, is presented. It is a peculiar orophyte occurring on the carbonatic substrata of many central-southern Apennine massifs and northern Sicilian ranges. Based on several morphological features, it is possible to distinguish three new subspecies, well differentiated also from a phytogeographical viewpoint. They are subsp. nitida (Abruzzi to Mt. Pollino), subsp. aprutia (C-Apennines) and subsp. sicula (N-Sicily). Each taxon is also examined from the chorological, ecological, and nomenclatural point of view. An iconography is also provided.
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