Bruce,
Could you post a picture? I get a least 2 distinct looking plants with a Google of the Genus name
If you've heard duck it eat I'd try um out the probably do. My duck and geese LOVE the seeds from a similar looking but distinctly unrelated (and unknown) weed that grows around here. They do seem cognoscente
enough to leave a good 1/3 of the seed pods on plants for them to propagate though and thus far they don't seem to be allowing anything to seriously out compete them though. Only a year in. Human timescale and whatnot...