[Wikipedia] Food & Medicinal Uses, Invasive Weed Status: The seeds have been eaten, though the seeds are often very small and fiddly to utilize. It has been used internally as treatment for stomach cramps, colic and painful menstruation. Externally, it has been used to treat sores and wounds. The reports don't go into detail on which parts of the plant is used in the treatments. When the seeds are mixed with molasses, they are used to kill the internal parasite known as worms. It is an invasive species and noxious weed in many places. It is a weed of several agricultural crops, particularly soybeans, other types of dry edible beans, and sunflowers. (link added by Mary Ann Machi)