Rose Pink Sabatia angularis (Gentian) - also Marsh Pink and Bitterbloom
This pretty pink flower grows in a cluster to about 6 inches tall before it becomes prostrate and starts to look like it is creeping along like a phlox. Its distribution is Wisconsin in the west to southern Ontario and New York in the east, southward to Florida and Texas according to http://www.nearctica.com/flowers/dtoh/gentian/Sangul.htm. Rose Pink is a biennial, also known as Marsh Pink and Bitterbloom according to http://2bnthewild.com/plants/H361.htm. Other wildflower sites I found useful when clicking around to identify Rose Pink http://www.biosurvey.ou.edu/okwild/toc.html http://www.birdmom.net/wildflowerspink.html http://www.wvu.edu/~agexten/hortcult/flowers/wldflwrs.htm http://www.okprairie.com/Flowers.htm#June Wildflowers http://oklahomawildflowers.blogspot.com/ http://uswildflowers.com/wflist.php http://2bnthewild.com/plants/H361.htm http://www.missouriwildflowerguide.com/RedPink.asp http://www.ct-botanical-society.org/galleries/sabatiaangu.html