Walking through a nearby forest preserve after dinner last night, we came upon this bed of interesting plants. Each leafy green, umbrella-shaped plant carefully protected a single white blossom. It was quite windy, and I had to sit patiently until the plant was still enough to take this photo. Processed using Topaz Adjust, added a vignette in Photoshop, and dodged the flower somewhat to brighten it up. Does anyone know what this is?