Does anyone know what this flower is?

Star of Bethlehem (I think). Ornithogalum.

The thread " Star of Bethlehem (Ornithogalum umbellatum)" in Plant ID forum

Those look like some type of Rain Lily. Did they bloom right after a good rain?

To me also they look like Rain Lilies. The leaves are there to show the clue too. It's very nice all of them are up at the same time - lovely anyway! In my garden they bloomed 4-5 days after an early summer shower in March.

I had posted a query - some clues may be there for you? --http://garden.org/thread/view/34331/Rain-Lilies---white---difference-between-two/

The thread " Star of Bethlehem (Ornithogalum umbellatum)" in Plant ID forum
Dinu flowers are different, your are branching , his every flower on one stem

I'm tending toward the Ornithogalum Star of Bethlehem.

I agree with jmorth. The relaxed foliage is key here as well as the bloom time. I've read that rain lilies tend to bloom later in the summer.

Thank you all for your comments. I also think that it is the Star of Bethlehem. I really need to stop planting things and not recording what I put where.

I took a closer look when you are all saying it is not rain lily. I noticed the buds - that I had missed -which looked very different. So I found this and realized I was incorrect. http://flowerinfo.org/star-of-... There are also some good close-up views of the flower that separates it from the rain lily.

Dinu - your comments do make me wonder if anyone here in the US midwest grows rain lilies. I'm not familiar with them at all.

I grow bunches of rain lilies, 3 kinds to be exact; all are grown in pots, overwintered in the basement

jmorth - thanks for posting that! I might have to look into those.