| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Crataegus laevigata | Plant | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Crataegus rhipidophylla | Flower | -- | -- | * | |
| Crataegus laevigata | Bud | -- | -- | * | |
| Crataegus laevigata | Flower | -- | -- | * | |
| Crataegus rhipidophylla | Tissue Culture | -- | -- | * | |
| Crataegus monogyna | Plant | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Crataegus laevigata | Tissue Culture | -- | -- | * | |
| Croton lechleri | Plant | -- | -- | * | |
| Eucalyptus globulus | Leaf | -- | -- | * | |
| Fagopyrum esculentum | Root | -- | -- | * | |
| Fagopyrum esculentum | Tissue Culture | -- | -- | * | |
| Fallopia japonica | Root | -- | 2.0 | * | |
| Geranium thunbergii | Tissue Culture | -- | -- | * | |
| Ginkgo biloba | Tissue Culture | -- | -- | Jim Duke's personal files. | |
| Ginkgo biloba | Leaf | -- | -- | Jim Duke's personal files. | |
| Gleditsia triacanthos | Fruit | -- | -- | * | |
| Glycine max | Leaf | -- | -- | * | |
| Hordeum vulgare | Seed | -- | -- | * | |
| Humulus lupulus | Fruit | -- | -- | * | |
| Hypericum perforatum | Plant | -- | -- | * |