| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Psidium guajava | Fruit | 520.0 | 3744.0 | -0.8 | USDA's Ag Handbook 8 and sequelae) |
| Psophocarpus tetragonolobus | Seed | 31870.0 | 34770.0 | 1.1 | * |
| Psophocarpus tetragonolobus | Leaf | 5170.0 | 22333.0 | -0.3 | * |
| Psophocarpus tetragonolobus | Tuber | 17350.0 | 40728.0 | 1.2 | * |
| Psoralea esculenta | Root | -- | 8989.0 | -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 | 770.0 | 4756.0 | -0.7 | * |
| Raphanus sativus | Root | 480.0 | 9300.0 | -0.1 | * |
| Rehmannia glutinosa | Root | 1000.0 | 39000.0 | 3.8 | * |
| Ribes nigrum | Fruit Juice | -- | 23.0 | * | |
| Rosmarinus officinalis | Leaf | 3910.0 | 12130.0 | -0.9 | USDA's Ag Handbook 8 and sequelae) |
| Sambucus canadensis | Fruit | 580.0 | 2871.0 | -1.0 | USDA's Ag Handbook 8 and sequelae) |
| Scutellaria baicalensis | Root | -- | -- | * | |
| Secale cereale | Seed | 11770.0 | 13215.0 | -0.8 | USDA's Ag Handbook 8 and sequelae) |
| Sechium edule | Fruit | 1010.0 | 14430.0 | 0.6 | * |
| Senna obtusifolia | Seed | -- | 15000.0 | -0.7 | * |
| Sesamum indicum | Seed | 9890.0 | 23795.0 | 0.1 | * |
| Sinapis alba | Seed | 19670.0 | 21050.0 | -0.1 | * |
| Solanum melongena | Fruit | 1770.0 | 21933.0 | 1.5 | * |
| Solanum tuberosum | Tuber | 4340.0 | 24050.0 | -0.6 | * |
| Spinacia oleracea | Plant | 2400.0 | 28502.0 | 0.6 | USDA's Ag Handbook 8 and sequelae) |