| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Crataegus rhipidophylla | Fruit | -- | -- | * | |
| Crataegus laevigata | Fruit | -- | -- | * | |
| Cinnamomum aromaticum | Bark | -- | -- | * | |
| Camellia sinensis | Leaf | -- | 5.8 | -1.0 | * |
| Aesculus hippocastanum | Seed Coat | 612.2 | 3066.7 | Jim Duke's personal files. | |
| Aesculus hippocastanum | Fruit Epidermis | -- | -- | Jim Duke's personal files. | |
| Aesculus hippocastanum | Leaf | -- | -- | Jim Duke's personal files. |