| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Petroselinum crispum | Plant | 1.0 | 12.0 | -0.2 | * |
| Petasites japonicus | Plant | 15.0 | 16.0 | 0.2 | Chem. & Pharm. Bull. 38: 2205. |
| Persea americana | Fruit | 2.0 | 11.0 | -0.1 | * |
| Perilla frutescens | Plant | -- | 17.0 | 0.3 | Suziki, A., Morimoto, I., and Okitzu, T., Elution of Metals from Crude Drugs, Shoykugaku Zasshi 36(3):190-195. |
| Peganum harmala | Plant | -- | 9.0 | -0.6 | * |
| Pastinaca sativa | Root | 0.8 | 12.0 | 0.0 | * |
| Papaver somniferum | Seed | 16.0 | 23.0 | 0.7 | * |
| Panax ginseng | Stem | -- | -- | * | |
| Panax ginseng | Flower | -- | -- | * | |
| Panax japonicus | Rhizome | -- | 6.0 | -1.0 | * |
| Panax ginseng | Leaf | -- | -- | * | |
| Panax ginseng | Inflorescence | -- | -- | * | |
| Panax ginseng | Root | -- | 17.0 | 0.6 | * |
| Panax ginseng | Fruit | -- | -- | * | |
| Panax quinquefolius | Plant | 6.0 | 13.0 | -0.1 | * |
| Paeonia moutan | Root Bark | 5.0 | 6.0 | -0.8 | * |
| Paeonia lactiflora | Root | 3.0 | 6.0 | -0.6 | * |
| Paeonia suffruticosa | Root Bark | 5.0 | 6.0 | -0.8 | * |
| Pachyrhizus erosus | Tuber | 4.0 | 25.0 | 1.9 | * |
| Origanum vulgare | Plant | -- | 9.0 | -0.6 | USDA's Ag Handbook 8 and sequelae) |