| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Psidium cattleianum | Fruit | 120.0 | 620.0 | -0.2 | * |
| Psophocarpus tetragonolobus | Seed | 10.0 | 305.0 | -0.3 | * |
| Psophocarpus tetragonolobus | Leaf | 10.0 | 43.0 | -0.7 | * |
| Quisqualis indica | Seed | 10350.0 | 12150.0 | -0.1 | * |
| Raphanus sativus | Root | -- | -- | * | |
| Rhus toxicodendron | Fruit | -- | -- | * | |
| Rosmarinus officinalis | Leaf | 1210.0 | 3755.0 | 1.9 | USDA's Ag Handbook 8 and sequelae) |
| Salvia sp. | Seed | 230.0 | 360.0 | -0.3 | * |
| Sambucus nigra | Flower | -- | -- | * | |
| Sambucus nigra | Seed | -- | -- | * | |
| Secale cereale | Seed | 30.0 | 35.0 | -0.3 | USDA's Ag Handbook 8 and sequelae) |
| Serenoa repens | Seed | -- | -- | * | |
| Serenoa repens | Fruit | 4800.0 | 116000.0 | 5.2 | * |
| Sesamum indicum | Seed | 328.0 | 1728.0 | -0.3 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Sesamum indicum | Seed Oil | -- | -- | * | |
| Silybum marianum | Seed | -- | -- | * | |
| Solanum tuberosum | Tuber | 10.0 | 48.0 | * | |
| Spartium junceum | Seed | -- | -- | * | |
| Spinacia oleracea | Plant | 1.0 | 950.0 | -0.3 | * |
| Sterculia urens | Seed | 9300.0 | 12090.0 | -0.1 | * |