| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Ephedra sinica | Plant | 700.0 | 22500.0 | 1.0 | * |
| Ephedra gerardiana | Plant | 4000.0 | 7000.0 | -1.0 | * |
| Ephedra nevadensis | Plant | -- | -- | * | |
| Catha edulis | Leaf | -- | -- | * | |
| Sida rhombifolia | Root | -- | -- | * | |
| Aconitum napellus | Root | -- | -- | * | |
| Taxus baccata | Leaf | -- | -- | * | |
| Ephedra sinica | Shoot | 1700.0 | 22700.0 | Jim Duke's personal files. | |
| Ephedra sinica | Root | -- | -- | Jim Duke's personal files. | |
| Ephedra nevadensis | Stem | -- | -- | Jim Duke's personal files. | |
| Ephedra nevadensis | Root | -- | -- | Jim Duke's personal files. | |
| Ephedra nevadensis | Branches | -- | -- | Jim Duke's personal files. |