| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Plantago ovata | Seed | -- | -- | * | |
| Portulaca oleracea | Herb | 460.0 | 11000.0 | -1.0 | * |
| Prunus cerasus | Fruit | -- | -- | * | |
| Prunus persica | Fruit | 240.0 | 1944.0 | -0.6 | * |
| Prunus armeniaca | Fruit | 400.0 | 2930.0 | -0.3 | USDA's Ag Handbook 8 and sequelae) |
| Prunus dulcis | Seed | 12360.0 | 12929.0 | 0.3 | USDA's Ag Handbook 8 and sequelae) |
| Prunus domestica | Fruit | 120.0 | 811.0 | -1.1 | USDA's Ag Handbook 8 and sequelae) |
| Psidium guajava | Fruit | 410.0 | 2952.0 | -0.3 | USDA's Ag Handbook 8 and sequelae) |
| Psidium cattleianum | Fruit | 290.0 | 1500.0 | -0.8 | * |
| Psophocarpus tetragonolobus | Leaf | 1490.0 | 6436.0 | -1.1 | * |
| Psophocarpus tetragonolobus | Tuber | 3900.0 | 9155.0 | 1.5 | * |
| Psophocarpus tetragonolobus | Seed | 11400.0 | 12437.0 | 0.2 | * |
| Psoralea esculenta | Root | -- | 1097.0 | -1.3 | Izadoost, M. & Robinson, T., Synergism & antagonism in the pharmacology of alkaloidal plants, pp 137-58 in Craker, L. & Simon, J., eds., Herbs, Spices & Medicinal Plants: Recent Advances in Botany, Horticulture & Pharmacology, v. 2, 1987, 255pp. |
| Pyrus communis | Fruit | 110.0 | 679.0 | -1.1 | * |
| Raphanus sativus | Root | 220.0 | 4265.0 | 1.1 | * |
| Rehmannia glutinosa | Root | 1000.0 | 2000.0 | -0.6 | * |
| Rosmarinus officinalis | Leaf | 1590.0 | 4935.0 | -1.5 | USDA's Ag Handbook 8 and sequelae) |
| Salvia officinalis | Plant | -- | -- | Stitt, Paul. Why George should eat broccoli. | |
| Sambucus canadensis | Fruit | 360.0 | 1782.0 | -0.7 | USDA's Ag Handbook 8 and sequelae) |
| Scutellaria baicalensis | Root | -- | -- | * |