| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Iris x germanica | Rhizome | -- | -- | * | |
| Vanilla planifolia | Fruit | -- | 21.0 | * | |
| Dipteryx odorata | Bark | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Rheum palmatum | Rhizome | -- | 1.5 | * | |
| Jasminum officinale | Flower | -- | -- | * |