| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Rumex acetosa | Leaf | -- | 500.0 | -0.6 | * |
| Sambucus nigra | Plant | -- | -- | Newall, C. A., Anderson, L. A. and Phillipson, J. D. 1996. Herbal Medicine - A Guide for Health-care Professionals. The Pharmaceutical Press, London. 296pp. | |
| Sarracenia rubra | Leaf | -- | -- | * | |
| Sarracenia rubra | Leaf | -- | -- | * | |
| Sarracenia rubra | Leaf | -- | -- | * | |
| Sarracenia oreophila | Leaf | -- | -- | * | |
| Sarracenia flava | Leaf | -- | -- | * | |
| Sarracenia purpurea | Leaf | -- | -- | * | |
| Sarracenia minor | Leaf | -- | -- | * | |
| Sarracenia leucophylla | Leaf | -- | -- | * | |
| Sarracenia alata | Leaf | -- | -- | * | |
| Sarracenia psittacina | Leaf | -- | -- | * | |
| Selenicereus grandiflorus | Flower | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Solidago gigantea | Flower | -- | -- | * | |
| Spinacia oleracea | Shoot | -- | -- | * | |
| Syzygium aromaticum | Fruit | -- | -- | * | |
| Trifolium pratense | Leaf | -- | -- | * | |
| Trifolium pratense | Flower | -- | -- | * | |
| Trifolium pratense | Plant | -- | -- | * | |
| Tussilago farfara | Flower | -- | 2800.0 | -1.0 | * |