| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Acacia farnesiana | Plant | -- | -- | Rizk, A.F.M. and Al-Nowaihi, A.S., The Phytochemistry of the Horticultural Plants of Qatar, Scientific and Applied Research Centre, University of Qatar. | |
| Camellia sinensis | Shoot | -- | -- | * | |
| Coleus blumei | Plant | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Equisetum arvense | Plant | -- | -- | Jim Duke's personal files. | |
| Eucalyptus citriodora | Root | -- | 267.0 | * | |
| Eucalyptus citriodora | Plant | -- | -- | J.S. Glasby Dict.Pls Containing 2ndary Metabolite. 1991. | |
| Maclura pomifera | Heart Wood | -- | -- | * | |
| Maclura pomifera | Tissue Culture | -- | -- | * | |
| Maclura pomifera | Bark | -- | 857.0 | * | |
| Origanum vulgare | Plant | -- | -- | Stitt, Paul. Why George should eat broccoli. | |
| Origanum vulgare | Leaf | -- | -- | * | |
| Prunus cerasus | Plant | -- | -- | * | |
| Silybum marianum | Fruit | -- | 150.0 | * |