| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Rosmarinus officinalis | Resin, Exudate, Sap | -- | -- | * | |
| Cinnamomum aromaticum | Plant | -- | -- | * | |
| Liquidambar orientalis | Essential Oil | -- | -- | * | |
| Myroxylon balsamum | Plant | -- | -- | * | |
| Carica papaya | Fruit | -- | -- | Jim Duke's personal files. | |
| Styrax benzoin | Plant | -- | -- | * | |
| Liquidambar styraciflua | Resin, Exudate, Sap | -- | -- | * | |
| Ephedra sinica | Shoot | -- | -- | * |