I have been trying for weeks to identify a small white flower I have seen naturalized all over the lawns and roadsides of Hunterdon Co. It's a bulb, it grows about 4 inches high, it has two symmetric leaves that are like minature tulip leaves, and it produces four or five small, white, bell-shaped flowers that nod down from the top of the stem. They alternate on the stem and have faint pink lines inside the cup. I have ruled out windflower, which someone suggested. It could be something in the snowdrop family, I guess. Can anyone help?