Hi, Dr. Hill,
This is another Fall Line plant, growing along the edge of a pond and in mucky areas where the water has receded, in full sun. I took some of the photos on Sept. 1. I’m also attaching close-ups of the leaves and one of the full plant which is about 1-1/2 feet tall. Thank you for the recent identifications.
your plant is one of the Hypericum species, and I am rather certain it is Hypericum walteri, once called Triadenum walteri. It is a member of a group of three pink-flowered Hypericums, H. tubulosum, H. virginicum and H. walteri. The lower leaves of H. tubulosum are sessile, those of H. virginicum are cordate clasping, and yours match those of H. walteri.
Glad I can help!
Steven Hill, Ph.D., Botanist SCNPS