WOW! some more great shots showing up here, I'm almost tempted not to post my mediocre attempts...almost..
That last yellow one posted by eccs19 is a member of the Legume family, a relative of peas. The others I can't identify, my books are not that comprehensive and concentrate mostly on the southern part of the US.
Here's one I think is a Blazing Star, but not positive. The picture in the book is taken from further away and I can't see enough detail. Each flower in the cluster is about 3/8 inch across.
This is a small white flower about the same size, 3/8 inch or so.
This blue one is about the size of a dime, always growing very close to water every time I find it.
click on each picture to view larger size image.
I guess that's it for now, I have a few more I'll have to dig up, and hope to be getting more later on. The tiniest ones are really difficult, I seem to get more noise than anything else, but I might go ahead and post the Dill blooms later anyway, they're the size of a pinhead, I figure I'm lucky to get a recognizable shot at all...I've been trying to get a decent shot of a couple more tiny white flowers the past few days, between 1/8 and 1/4 inch, so far nothing good enough to show off.
Keep 'em coming, I'm really liking the nice shots so far. Great work everyone.