There are many kinds of snowdrops with three in this vase including the most common Galanthus Nivalis and the double variety.  I like the unusual deep green marks on the outside of the inner petals of the two taller snowdrops and am unsure if they are the Giant snowdrop (Galanthus elwesii)   If it had not been snowing I would have picked fresher flowers in the hope that someone might be able to identify it.