Noxious and Invasive Weeds as Medicine: An Alternative for the pesticide treadmill and a way to reduce use of At-Risk Medicinal Plants. Published on: 2018Author: Kelly KindscherSurvey program: Kansas Biological SurveyCitation HTML: Upton, R (Editor), K. Kindscher (Associate Editor). 2018. Oshá Root (Ligusticum porteri J.M. Coulter & Rose and related species. American Herbal Pharmacopoeia. 83 pages.