Credit: Image courtesy of Robert Garner, PBase Gallery, 2006.
Found throughout the northern half of the U.S. and into Southern Canada; common in waste areas and disturbed soils, as well as a contaminant in alfalfa and other hay fields.
Poisonings can occur from ingesting the dried plant in hay, or from grazing on large amounts of the plant in fields. Clinical signs generally occur after a day to a few days after ingestion, and include fever, swollen limbs, colic, bloody diarrhea, laminitis, premature births, loss of appetite, dehydration and death. Deaths are usually associated with the consumption of hay containing 30 to 70% of plant.
Toxic to Horses