There are growing as a weed in a Concord, Massachusetts garden. They're distinctive in appearance, but I haven't been able to identify them. Paul
Thank you. I think you're right. It doesn't look much like the drawing of Mollugo verticillata in Newcomb's Wildflower Guide, since Newcomb shows it with narrow leaves and small flowers, but it looks much more like this photo: http://calphotos.berkeley.edu/cgi/img_query?query_src=&enlarge=0000+0000+1104+0718 Paul