| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Phaseolus vulgaris | Shoot | -- | -- | * | |
| Prunella vulgaris | Shoot | -- | -- | * | |
| Scopolia carniolica | Leaf | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Taraxacum officinale | Flower | -- | -- | * | |
| Urtica dioica | Plant | -- | -- | Jim Duke's personal files. | |
| Viburnum prunifolium | Bark | -- | -- | * | |
| Viburnum opulus | Bark | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |