Bluntleaf sandwort (Moehringia lateriflora) is a common but often overlooked perennial forb. It occurs in Asia, northern Europe, and North America. In the United States it is common in the northern tier of states but absent in the south. It is very common in Minnesota. It is found in woodland edges and openings, open woodlands, and gravely riverbanks, and less commonly in meadows and prairies.

Bluntleaf sandwort is a low plant. The stems are much branched, less than 12″ long, and weak. They either curve up from the base or recline on the ground with only the tip ascending. The leaves are opposite, broadly ellipse-shaped, and no more than 1¼″ long. From mid-spring to early summer it produces a few small but showy white flowers.

Bluntleaf sandwort is similar in appearance to chickweeds, but the petals are neither deeply cut nor notched.

http://www.minnesotaseasons.com/Plants/bluntleaf_sandwort.html