| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Prunus persica | Seed | -- | -- | * | |
| Prunus cerasus | Plant | -- | -- | * | |
| Prunus dulcis | Sprout Seedling | 30.0 | 33.0 | -1.2 | Spiller, G. A. 1996 (Spiller, G. A. Ed. 1996. CRC Handbook of Lipids in Human Nutrition. CRC Press. Boca Raton, FL. 233 pp.) |
| Psoralea corylifolia | Seed | -- | 50.0 | -0.5 | * |
| Pterocarpus santalinus | Plant | -- | -- | * | |
| Ptychopetalum olacoides | Root | -- | -- | Ito, Y., Hirayama, F., Aikawa, Y., Kondo, H., Sagara, K., Shoji, J. 1995. Constituents from Muira-Puama (The Roots of Ptychopetalum olacoides). Nat. Med. 49, 4: 487. | |
| Pueraria montana | Stem | -- | -- | * | |
| Punica granatum | Seed | -- | -- | * | |
| Rauvolfia serpentina | Plant | -- | -- | * | |
| Rauvolfia vomitoria | Root | -- | -- | * | |
| Ricinus communis | Leaf | -- | -- | Rizk, A.F.M. and Al-Nowaihi, A.S., The Phytochemistry of the Horticultural Plants of Qatar, Scientific and Applied Research Centre, University of Qatar. | |
| Rosmarinus officinalis | Shoot | 50.0 | 700.0 | 1.0 | * |
| Rubus fruticosus | Plant | -- | -- | * | |
| Ruellia tuberosa | Plant | -- | -- | J.S. Glasby Dict.Pls Containing 2ndary Metabolite. 1991. | |
| Ruscus aculeatus | Root | -- | -- | * | |
| Salvia officinalis | Fruit Essent. Oil | -- | -- | * | |
| Salvia officinalis | Leaf | 5.0 | 230.0 | 1.8 | * |
| Sambucus nigra | Leaf | -- | -- | * | |
| Sambucus canadensis | Leaf | -- | -- | * | |
| Sambucus nigra | Flower | -- | -- | * |