| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Hypericum perforatum | Plant | -- | -- | * | |
| Hypericum perforatum | Leaf | -- | -- | * | |
| Maclura pomifera | Wood | -- | -- | Smith, J. L. and Perino, J. V. 1981. Osage Orange (Maclura pomifera): History and Economic Uses. Economic Botany 35(1): 24-41 | |
| Maclura pomifera | Heart Wood | -- | 917.0 | * |