| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Prunus domestica | Fruit | 160.0 | 1081.0 | -0.8 | USDA's Ag Handbook 8 and sequelae) |
| Psidium guajava | Fruit | 310.0 | 2232.0 | -0.3 | USDA's Ag Handbook 8 and sequelae) |
| Psidium cattleianum | Fruit | 220.0 | 1140.0 | -0.8 | * |
| Psophocarpus tetragonolobus | Seed | 11790.0 | 12863.0 | 1.1 | * |
| Psophocarpus tetragonolobus | Leaf | 1820.0 | 7862.0 | -0.6 | * |
| Psophocarpus tetragonolobus | Tuber | 4510.0 | 10587.0 | 1.7 | * |
| Psoralea esculenta | Root | -- | 1477.0 | -0.7 | 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 | 100.0 | 618.0 | -1.0 | * |
| Raphanus sativus | Root | 290.0 | 5620.0 | 0.6 | * |
| Rehmannia glutinosa | Root | 1000.0 | 16000.0 | 3.7 | * |
| Ribes nigrum | Fruit Juice | -- | 17.0 | * | |
| Rosmarinus officinalis | Leaf | 1360.0 | 4220.0 | -1.9 | USDA's Ag Handbook 8 and sequelae) |
| Sambucus canadensis | Fruit | 270.0 | 1336.0 | -0.7 | USDA's Ag Handbook 8 and sequelae) |
| Scutellaria baicalensis | Root | -- | -- | * | |
| Secale cereale | Seed | 5320.0 | 5975.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Sechium edule | Fruit | 440.0 | 6285.0 | 1.4 | * |
| Senna obtusifolia | Seed | -- | 5940.0 | -0.5 | * |
| Sesamum indicum | Seed | 7360.0 | 12396.0 | 1.0 | * |
| Sinapis alba | Seed | 10950.0 | 11720.0 | 0.8 | * |
| Solanum tuberosum | Tuber | 750.0 | 4300.0 | -0.4 | * |