Yucca filamentosa adam's needle - ( Yucca, Adam's Needle ) Part Used: Roots. Medicinal Properties: Am. Indians used poulticed root in salves/poultices for sores, skin diseases, sprains. Poulticed root in water to stupefy fish for harvesting. Fruits used as food. Saponins in roots produces soaping for washing *(saponins are TOXIC to lower life forms.