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Alessandro, I doubt it is endemic, it is widespread in our forests.
And flowering in a carpet of Erythronium americanum, I think .
Last year in April I was given some tiny bulbs by Austrian relatives.They just told me they were flowering yellow and growing in their meadow.I had an idea of Gagea, but was not sure.Now they are flowering with me.Gagea lutea
Lvandelftyour photo seems to belong to Gagea spathacea