Ambrosia psilostachya is a species of ragweed known by the common names Cuman ragweed and perennial ragweed, and western ragweed. Traditional use Ambrosia cumanensis; herb teas for yellow fever, constipation, menorrhagia. Herb juice for pleurisy. Root or herb infusions for colds, flu, fever, in postpartum depurants. Herb of second growth crushed leaves mixed with chicken fat and/or hot water, cool mixture rubbed on