| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Piper betel | Leaf | 10000.0 | 31000.0 | -0.1 | * |
| Pistacia lentiscus | Seed | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Pisum sativum | Seed | 329000.0 | 434000.0 | 0.5 | * |
| Polygonum multiflorum | Root | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Polypodium vulgare | Rhizome | -- | 63000.0 | -2.4 | * |
| Prosopis juliflora | Fruit | -- | 163600.0 | -0.2 | * |
| Prunus persica | Seed | -- | 36000.0 | -1.1 | * |
| Psidium guajava | Seed | 130000.0 | 132000.0 | -0.7 | * |
| Psoralea esculenta | Root | -- | 698400.0 | 1.6 | 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. |
| Pteridium aquilinum | Rhizome | -- | 450000.0 | 0.1 | * |
| Pueraria montana | Root | 130000.0 | 400000.0 | 0.4 | * |
| Pueraria pseudohirsuta | Root | 100000.0 | 150000.0 | -0.7 | * |
| Punica granatum | Seed | -- | -- | -1.3 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Quillaja saponaria | Bark | -- | -- | * | |
| Rauvolfia serpentina | Seed | 126000.0 | 203000.0 | -0.4 | * |
| Rheum officinale | Root | 150000.0 | 160000.0 | -0.7 | * |
| Ribes uva-crispa | Fruit | -- | 15000.0 | -0.4 | * |
| Rosa canina | Fruit | 33660.0 | 180000.0 | -0.2 | * |
| Rumex hymenosepalus | Plant | 250000.0 | 400000.0 | 1.5 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Ruscus aculeatus | Root | 36240.0 | 120000.0 | -0.8 | * |