| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Arachis hypogaea | Plant | -- | -- | * | |
| Trifolium pratense | Shoot | -- | -- | * | |
| Trifolium pratense | Plant | -- | -- | Newall, C. A., Anderson, L. A. and Phillipson, J. D. 1996. Herbal Medicine - A Guide for Health-care Professionals. The Pharmaceutical Press, London. 296pp. |