Pure white flower, one per stem, about 10 inches off the ground. Perennial. I think this is A. sylvestris. What do you think?
Gene, I'm about to walk down the street to photograph A. sylvestris for comparison. Back shortly...
And... (a few minutes later ;))... here is Anemone sylvestris, about a foot tall, spreading:
From this at least, I would not guess that your Anemone #3 is either... I'm sure no expert though! Can anyone else help out?