| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Acacia catechu | Plant | -- | -- | * | |
| Equisetum arvense | Plant | -- | -- | Jim Duke's personal files. | |
| Eucalyptus globulus | Stem Bark | -- | 2.0 | * | |
| Origanum vulgare | Leaf | -- | -- | * | |
| Pinus sylvestris | Leaf | -- | -- | * | |
| Prunus cerasus | Plant | -- | -- | * | |
| Robinia pseudoacacia | Wood | -- | 40000.0 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Silybum marianum | Fruit | 100.0 | 8000.0 | * | |
| Silybum marianum | Seed | -- | -- | * | |
| Urginea maritima | Bulb | -- | -- | * |