"Plant","Part","Low PPM","High PPM","StdDev","Reference"
"Achillea millefolium","Plant",,,,"Williamson, E. M. and Evans, F. J., Potter's New Cyclopaedia of Botanical Drugs and Preparations, Revised Ed., Saffron Walden, the C. W. Daniel Co., Ltd., Essex UK, 362 pp, 1988, reprint 1989."
"Artemisia absinthium","Flower",,,,"--"