| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Tagetes minuta | Flower Essent. Oil | -- | 200.0 | * | |
| Scutellaria lateriflora | 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. | |
| Citrus paradisi | Plant | -- | -- | * | |
| Populus tacamahacca | Plant | -- | -- | * | |
| Myroxylon balsamum | Wood | -- | -- | * |