Ornithogalum umbellatum was my guess... (found several bulbils surrounding the main bulb). Now, if you take a closer look, you can see that the inflorescence is a strict umbell (should be a corymb). There are also two leaves which seem to be in the function of bracts, something I haven't seen in Ornithogalum. Also, tepals should be more white on the inner side, but that could well be a variable characteristic. Maybe this is some kind of a deformed or underdeveloped Ornithogalum? Any thoughts? A different genus?