| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Pinus pinea | Seed | 5750.0 | 7475.0 | 0.4 | * |
| Pinus edulis | Seed | 2770.0 | 2945.0 | -0.8 | USDA's Ag Handbook 8 and sequelae) |
| Pistacia vera | Seed | 5360.0 | 5576.0 | -0.1 | * |
| Pisum sativum | Seed | 1070.0 | 5061.0 | -0.3 | * |
| Pisum sativum | Fruit | 170.0 | 1682.0 | -0.0 | * |
| Portulaca oleracea | Herb | 220.0 | 5170.0 | -1.0 | * |
| Prunus domestica | Fruit | 130.0 | 878.0 | -0.6 | USDA's Ag Handbook 8 and sequelae) |
| Prunus persica | Fruit | 130.0 | 1053.0 | -0.5 | * |
| Prunus armeniaca | Fruit | 270.0 | 1980.0 | 0.2 | USDA's Ag Handbook 8 and sequelae) |
| Prunus dulcis | Seed | 5580.0 | 5837.0 | -0.1 | USDA's Ag Handbook 8 and sequelae) |
| Psidium guajava | Fruit | 70.0 | 504.0 | -0.8 | USDA's Ag Handbook 8 and sequelae) |
| Psidium cattleianum | Fruit | 50.0 | 260.0 | -1.0 | * |
| Psophocarpus tetragonolobus | Leaf | 7900.0 | 8618.0 | 1.6 | * |
| Psophocarpus tetragonolobus | Tuber | 2410.0 | 5657.0 | 1.6 | * |
| Psoralea esculenta | Root | -- | 1266.0 | -0.5 | 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 | 40.0 | 247.0 | -1.0 | * |
| Raphanus sativus | Root | 130.0 | 2520.0 | 0.7 | * |
| Rehmannia glutinosa | Root | 1000.0 | 4000.0 | 2.2 | * |
| Rosmarinus officinalis | Leaf | 660.0 | 2050.0 | -1.7 | USDA's Ag Handbook 8 and sequelae) |
| Sambucus canadensis | Fruit | 150.0 | 742.0 | -0.7 | USDA's Ag Handbook 8 and sequelae) |