| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Citrus limon | Pericarp | -- | -- | Jim Duke's personal files. | |
| Syringa vulgaris | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Plantago major | Plant | -- | -- | * | |
| Forsythia suspensa | Leaf | -- | -- | * | |
| Scrophularia scorodonia | Stem | -- | -- | * | |
| Robinia pseudoacacia | Bark | -- | -- | * | |
| Ligustrum japonicum | Bark | -- | -- | * | |
| Ligustrum japonicum | Leaf | -- | -- | * | |
| Ligustrum vulgare | Leaf | -- | -- | * | |
| Magnolia kobus | Bark | -- | -- | * | |
| Eleutherococcus senticosus | Tissue Culture | -- | -- | * | |
| Eleutherococcus senticosus | Stem | -- | -- | * | |
| Schisandra chinensis | Leaf | -- | -- | * | |
| Viscum album | Plant | -- | -- | * | |
| Eleutherococcus senticosus | Stem Bark | -- | 24.0 | * | |
| Eleutherococcus senticosus | Root Bark | -- | 1370.0 | * | |
| Eleutherococcus senticosus | Root | 40.0 | 4000.0 | * |