| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Panax ginseng | Root Essent. Oil | -- | 23000.0 | * | |
| Panax ginseng | Plant | -- | -- | * | |
| Arctium lappa | Leaf | -- | -- | * | |
| Eucalyptus globulus | Fruit Essent. Oil | -- | -- | * | |
| Valeriana officinalis | Plant | -- | -- | * | |
| Petasites hybridus | Rhizome | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Valeriana officinalis | Root | -- | -- | * |