| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Malus domestica | Heart Wood | -- | -- | * | |
| Malus domestica | Fruit | -- | -- | * | |
| Matricaria recutita | Plant | -- | -- | Kameoka, H. and Nakai, K. 1987. Components of essential oil from the root of Glycyrrhiza-glabra. Nippon Gogeikagaku Kaishi 61(9): 1119-1122. | |
| Medicago sativa | Seed | -- | -- | * | |
| Menyanthes trifoliata | Plant | -- | -- | * | |
| Nelumbo nucifera | Flower | -- | -- | * | |
| Ononis spinosa | Shoot | -- | -- | 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. | |
| Piper nigrum | Fruit | -- | -- | * | |
| Podophyllum pleianthum | Rhizome | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Polygonum multiflorum | Fruit | -- | 3000.0 | * | |
| Prunella vulgaris | Plant | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Prunus armeniaca | Fruit | -- | -- | * | |
| Prunus cerasus | Plant | -- | -- | * | |
| Prunus spinosa | Flower | -- | -- | * | |
| Psidium guajava | Leaf | -- | -- | * | |
| Rhododendron dauricum | Plant | -- | -- | * | |
| Ricinus communis | Flower | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Ricinus communis | Leaf | -- | -- | * | |
| Rosa canina | Leaf | -- | 30.0 | -0.7 | * |
| Rumex crispus | Leaf | -- | -- | * |