I think you got it that time.
I looked around at several images of American Columbo online and I would say 99.9% sure that is it.
Here is a nice pic showing it with several in the Bolt to Flower Spike stage and a few without the spike.
I found the info below on it's Medicinal use..
Medicinal use of American Columbo: The powdered plant is applied externally to ulcers as a poultice. The plant is a feeble simple bitter. The root is cathartic, emetic, stimulant and tonic. When dried it is a simple bitter that can be used as a digestive tonic in a similar way to gentian root (Gentiana spp), but the fresh root is cathartic and emetic. The root is used in the treatment of dysentery, stomach complaints and a lack of appetite. It should be harvested in the autumn of its second year, or the spring of its third year.
Dosages---Of powder, 1 to 3 grains. Of infusion of 1 fluid ounce to 1 pint of boiling water - 2 fluid ounces a day.