| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Nicotiana rustica | Leaf | -- | -- | * | |
| Nicotiana glauca | Leaf | -- | -- | * | |
| Solanum tuberosum | Tuber | 4.8 | 15.0 | * | |
| Solanum tuberosum | Plant | -- | -- | * | |
| Withania somnifera | Root | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |