Ron Hardin wrote:
What's this umbrella-like weed, Central Ohio
http://home.att.net/~rhhardin5/w30.jpg

Does it put out a flower eventually, or am I watching them in vain?

It is Podophyllum peltatum, in Berberidaceae. It's perennial and
single-leaf plants won't bloom this year. When old enough and strong
enough, the plant will send up a 2-leaf stem, with one flower between them.