It is easily discovered. The white flower heads are up to five inches across; the plants themselves up to five feet tall. The lanceolate leaves are opposite and united at the base so as to completely surround the stem. They like wet places along the shores of lakes, bogs and streams. They flower in late summer. Audubon gives the origin of its name: because the stem seemingly grows straight through the leaves, it was thought by the ancient doctors to be good when setting bones. The leaves were wrapped around the splints to assist in the healing process. More generally, it is a plant highly valued for its medicinal properties. I quote Audubon: "The dried leaves have also been used to make a tonic, boneset tea,thought effective in treating colds, coughs, and constipation."