Sabatia campanulata- Slender Marsh Pink
Superficially similar to S. stellaris, but in S. campanulata, the leaves are broader toward the base (at the stem) where S. stellaris the leaves taper toward the stem. Also, and perhaps most noteworthy, is the calyx lobes nearly equal the corolla lobes in S. campanulata where in S. stellaris they are notably shorter. This is an S3 G5. This is a perennial, whereas S. stellaris is an annual.