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Goniolimon italicum is an endemic species to central Apennines (Italy). Here we provide the first report of heterostyly in this species. Two morphological types were identified: an S-morph with stamen filaments longer than gynoecia, stigmas with a papillate surface and finely reticulated pollen grains with very small spinules (Type B); and an L-morph with stamen filaments shorter than gynoecia, stigmas with a cob pattern and coarsely reticulated pollen grains with small spinules (Type A). Two new locations of G. italicum were found and are here reported.