| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Alnus glutinosa | Plant | -- | -- | * | |
| Coccinia grandis | Fruit | -- | -- | * | |
| Euphorbia hirta | Stem | -- | -- | * | |
| Euphorbia lathyris | Stem | -- | -- | * | |
| Inonotus obliquus | Plant | -- | -- | * | |
| Myrica cerifera | Plant | -- | -- | * | |
| Phragmites australis | Shoot | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |