| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Anogeissus latifolia | Plant | -- | -- | * | |
| Acacia nilotica | Plant | -- | -- | * | |
| Eucommia ulmoides | Leaf | -- | -- | * | |
| Hypericum perforatum | Plant | -- | -- | * | |
| Geranium thunbergii | Leaf | -- | -- | * | |
| Coriaria myrtifolia | Plant | -- | -- | * | |
| Ceratonia siliqua | Fruit | -- | -- | * | |
| Rubus sp. | Leaf | -- | -- | Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. |