| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Acacia farnesiana | Fruit | -- | -- | Wealth of India. | |
| Anacardium occidentale | Seed | -- | -- | * | |
| Artemisia dracunculus | Shoot | 44.0 | 97.0 | 1.0 | * |
| Camellia sinensis | Shoot | -- | -- | * | |
| Centaurea calcitrapa | Plant | -- | -- | * | |
| Citrus limon | Pericarp | -- | -- | Bisset, N.G., ed. 1994. Herbal Drugs and Phytopharmaceuticals. CRC Press. Boca Raton, FL. 566 pp. | |
| Citrus paradisi | Fruit | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Citrus sinensis | Pericarp | 35000.0 | 45800.0 | Jim Duke's personal files. | |
| Citrus aurantium | Plant | -- | -- | * | |
| Cynara cardunculus | Flower | -- | -- | Jim Duke's personal files. | |
| Equisetum arvense | Plant | -- | -- | * | |
| Eucalyptus globulus | Stem Bark | -- | 0.5 | * | |
| Glycine max | Leaf | -- | -- | * | |
| Glycyrrhiza glabra | Shoot | -- | -- | * | |
| Glycyrrhiza uralensis | Root | -- | -- | * | |
| Lippia graveolens | Shoot | -- | 70.0 | -1.0 | * |
| Lippia graveolens | Root | -- | 85.0 | * | |
| Lycopersicon esculentum | Fruit | -- | -- | * | |
| Maclura pomifera | Tissue Culture | -- | -- | * | |
| Monarda didyma | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |