| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Pinus pinea | Seed | 46680.0 | 71600.0 | 2.0 | * |
| Pistacia vera | Seed | 21860.0 | 22740.0 | -0.1 | * |
| Pisum sativum | Seed | 4280.0 | 20246.0 | -0.2 | * |
| Pisum sativum | Fruit | 1340.0 | 13254.0 | 2.4 | * |
| Portulaca oleracea | Herb | 520.0 | 10400.0 | -1.0 | * |
| Prunus cerasus | Fruit | -- | -- | * | |
| Prunus persica | Fruit | 180.0 | 1458.0 | -0.8 | * |
| Prunus armeniaca | Fruit | 450.0 | 3300.0 | -0.3 | USDA's Ag Handbook 8 and sequelae) |
| Prunus dulcis | Seed | 24950.0 | 26098.0 | 0.1 | USDA's Ag Handbook 8 and sequelae) |
| Prunus domestica | Fruit | 130.0 | 878.0 | -0.9 | USDA's Ag Handbook 8 and sequelae) |
| Psidium guajava | Fruit | 210.0 | 1512.0 | -0.7 | USDA's Ag Handbook 8 and sequelae) |
| Psidium cattleianum | Fruit | 150.0 | 775.0 | -0.9 | * |
| Psophocarpus tetragonolobus | Leaf | 1780.0 | 7689.0 | -0.8 | * |
| Psophocarpus tetragonolobus | Tuber | 4120.0 | 9671.0 | 0.5 | * |
| Psophocarpus tetragonolobus | Seed | 18860.0 | 20576.0 | -0.2 | * |
| Psoralea esculenta | Root | -- | 7976.0 | -0.1 | 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 | 70.0 | 432.0 | -1.0 | * |
| Raphanus sativus | Plant | -- | -- | * | |
| Rehmannia glutinosa | Root | 42000.0 | 87000.0 | 3.8 | * |
| Ribes nigrum | Fruit Juice | -- | 35.0 | * |