| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Scutellaria baicalensis | Root | 13.0 | 18.0 | 0.7 | * |
| Scrophularia buergeriana | Root | 5.0 | 6.0 | -0.6 | * |
| Schizonepeta tenuifolia | Plant | -- | 23.0 | 1.0 | * |
| Schisandra chinensis | Fruit | 5.0 | 11.0 | -0.1 | * |
| Satureja hortensis | Leaf | 8.0 | 9.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Satureja montana | Leaf | 8.0 | 9.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Sassafras albidum | Stem | 0.2 | 56.0 | -0.2 | * |
| Sassafras albidum | Leaf | 1.6 | 102.0 | 2.0 | * |
| Santalum acuminatum | Fruit | 2.0 | 9.0 | -0.3 | * |
| Salvia officinalis | Leaf | 7.0 | 8.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Salvia miltiorrhiza | Root | -- | 8.0 | -0.4 | Chen, H.C. and Lin, S.M. 1988. Determination of Mineral Elements in Certain Crude Drugs (Part 1), Kaohsiung J. Med. Sci., 4: 259-272. |
| Rumex acetosa | Leaf | 3.0 | 30.0 | 0.1 | * |
| Rubus chingii | Fruit | -- | 12.0 | -0.1 | * |
| Rubus idaeus | Fruit | 0.7 | 6.0 | -0.5 | Revised USDA data received 1993. |
| Rubus chamaemorus | Fruit | 0.7 | 5.6 | -0.6 | * |
| Rubia cordifolia | Root | -- | 15.0 | 0.4 | * |
| Rosmarinus officinalis | Plant | 5.0 | 6.0 | -0.9 | USDA's Ag Handbook 8 and sequelae) |
| Rosmarinus officinalis | Leaf | 3.0 | 19.0 | -0.2 | USDA's Ag Handbook 8 and sequelae) |
| Rosa laevigata | Fruit | 8.0 | 9.0 | -0.3 | * |
| Rosa canina | Fruit | 1.8 | 36.0 | 1.8 | * |