| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Morus alba | Plant | -- | -- | * | |
| Artemisia capillaris | Essential Oil | -- | -- | * | |
| Rheum palmatum | Rhizome | -- | 0.5 | * | |
| Ligustrum japonicum | Flower | -- | -- | * | |
| Nicotiana tabacum | Leaf | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Coffea arabica | Seed | -- | -- | Jim Duke's personal files. | |
| Camellia sinensis | Leaf | -- | -- | * | |
| Asparagus officinalis | Shoot | -- | -- | * | |
| Commiphora myrrha | Resin, Exudate, Sap | -- | -- | * |