It matches what Aunt Bett knew about it, Mary, though she only used it as a tea as far as I remember and for me it was only used for sore throats and also to break a fever. I also remember that she never touched the roots.
Mine comes back every year in the same spot and this year it migrated down the hill and into the lower daylily bed. I never planted any of it but I always just let it grow when I see it. This morning it's a brighter yellow, probably from the rain we had earlier.
It's good to read that link. It sort of validates things that were told to me by Aunt Bett. Thank you.