| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Mimosa pudica | Seed | -- | -- | * | |
| Papaver somniferum | Latex Exudate | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Polygonum hydropiper | Plant | -- | -- | * | |
| Cyperus rotundus | Root | -- | -- | * | |
| Urtica dioica | Root | -- | -- | * | |
| Pinus palustris | Resin, Exudate, Sap | -- | -- | Leung, A.Y., Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley & Sons, New York, 1980. | |
| Corchorus olitorius | Seed | -- | -- | * | |
| Croton lechleri | Latex Exudate | -- | -- | * |