| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Morus alba | Wood | -- | -- | * | |
| Maclura pomifera | Wood | -- | -- | Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. | |
| Maclura pomifera | Fruit | -- | -- | Smith, J. L. and Perino, J. V. 1981. Osage Orange (Maclura pomifera): History and Economic Uses. Economic Botany 35(1): 24-41 | |
| Garcinia mangostana | Wood | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) |