| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Pteridium aquilinum | Leaf | -- | 0.9 | 0.2 | * |
| Quercus stellata | Stem | 3.0 | 5.0 | -1.3 | * |
| Quercus phellos | Stem | 4.0 | 6.0 | 0.8 | * |
| Quercus rubra | Stem | 2.0 | 5.0 | -1.3 | * |
| Quercus alba | Stem | 2.0 | 6.0 | 0.8 | * |
| Quercus velutina | Stem | 2.0 | 5.0 | -1.3 | * |
| Quercus rubra | Seed | -- | 0.1 | -0.3 | * |
| Rhizophora mangle | Leaf | -- | -- | * | |
| Rhus glabra | Stem | 3.0 | 6.0 | 0.8 | * |
| Rumex acetosa | Leaf | 0.07 | 2.0 | 1.8 | * |
| Secale cereale | Seed | 0.07 | 0.08 | -0.3 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Sesamum indicum | Seed | -- | 0.023 | -0.3 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Solanum tuberosum | Plant | -- | 0.011 | -0.4 | * |
| Spinacia oleracea | Plant | -- | 0.2 | -0.4 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Spondias pinnata | Fruit | 0.04 | 0.61 | -0.3 | * |
| Symphoricarpos orbiculatus | Stem | 4.0 | 6.0 | 0.8 | * |
| Taraxacum officinale | Leaf | -- | -- | Chem. & Pharm. Bull. 38: 2205. | |
| Trachyspermum ammi | Fruit | -- | 0.45 | -0.3 | * |
| Trichosanthes anguina | Fruit | 0.01 | 0.2 | -0.3 | * |
| Vicia faba | Fruit | 0.09 | 0.6 | -0.3 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |