| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Malus domestica | Leaf | -- | 1425.0 | * | |
| Rhus coriaria | Leaf | -- | -- | Hansel, R., Keller, K., Rimpler, H., and Schneider, G. eds. 1992. Hager's Handbuch der Pharmazeutischen Praxis, Drogen (A-D), 1209 pp., 1993 (E-O), 970 pp., 1994 (P-Z), 1196 pp. Springer-Verlag, Berlin. | |
| Vaccinium vitis-idaea | Leaf | -- | -- | * | |
| Malus domestica | Fruit | -- | -- | * | |
| Psidium guajava | Leaf | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Filipendula ulmaria | Leaf | -- | -- | * | |
| Rumex crispus | Leaf | -- | -- | * | |
| Vaccinium myrtillus | Leaf | -- | -- | Gruenwald, J. et al. 1998. PDR for Herbal Medicine. 1st ed. Medical Economics Co., Montvale, NJ. 1244 pp. (abbreviated as PHR or Physicians Herbal Reference in my mind) | |
| Arctostaphylos uva-ursi | Leaf | -- | -- | * | |
| Foeniculum vulgare | Leaf | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Polygonum aviculare | Plant | -- | -- | * | |
| Rhododendron dauricum | Plant | -- | -- | * | |
| Malus domestica | Fruit Juice | -- | -- | * | |
| Juglans regia | Leaf | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Malus domestica | Pericarp | -- | -- | * | |
| Chimaphila umbellata | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Cinchona officinalis | Leaf | -- | -- | * | |
| Viscum album | Twig | -- | -- | * |