| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Malus domestica | Pericarp | -- | -- | * | |
| Malus domestica | Fruit | -- | -- | * | |
| Malus domestica | Leaf | 150.0 | 900.0 | -0.7 | * |
| Mitragyna speciosa | Leaf | -- | 150.0 | -0.7 | * |
| Myristica fragrans | Seed | -- | -- | * | |
| Pinus sylvestris | Plant | -- | -- | J.S. Glasby Dict.Pls Containing 2ndary Metabolite. 1991. | |
| Pterocarpus marsupium | Stem Bark | -- | -- | Blaschek, W., Hansel, R., Keller, K., Reichling, J., Rimpler, H., and Schneider, G. eds. 1998. Hager's Handbuch der Pharmazeutischen Praxis, Auflage Band 2 (A-K), 909 pp., (L-Z), 858 pp. Springer-Verlag, Berlin. | |
| Rheum officinale | Rhizome | -- | 3437.5 | * | |
| Rheum rhabarbarum | Root | -- | -- | * | |
| Rhododendron ponticum | Leaf | -- | -- | * | |
| Rubus idaeus | Leaf | -- | -- | * | |
| Rubus idaeus | Pericarp | -- | -- | * | |
| Rubus idaeus | Juice | -- | -- | * | |
| Rubus idaeus | Plant | -- | -- | * | |
| Rubus idaeus | Stem | -- | -- | * | |
| Rumex crispus | Plant | -- | -- | * | |
| Tamarindus indica | Seed | -- | -- | * | |
| Terminalia catappa | Bark | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Theobroma cacao | Leaf | -- | -- | * | |
| Uncaria tomentosa | Bark | -- | 25.0 | 1.0 | * |