| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Magnolia denudata | Bark | -- | -- | * | |
| Magnolia denudata | Bulb | -- | -- | * | |
| Magnolia denudata | Flower | -- | -- | * | |
| Magnolia denudata | Leaf | -- | -- | * | |
| Magnolia denudata | Twig | -- | -- | * | |
| Houttuynia cordata | Shoot | -- | -- | * | |
| Cinnamomum verum | Plant | -- | -- | * | |
| Syzygium aromaticum | Essential Oil | -- | -- | * | |
| Centella asiatica | Shoot | -- | -- | Jim Duke's personal files. | |
| Psidium guajava | Essential Oil | -- | -- | * | |
| Psidium guajava | Pericarp Essent. Oil | -- | -- | * | |
| Vitex agnus-castus | Flower | -- | -- | Jim Duke's personal files. | |
| Humulus lupulus | Essential Oil | -- | -- | * | |
| Piper auritum | Leaf | -- | -- | Tramil | |
| Vitex agnus-castus | Fruit | -- | -- | Jim Duke's personal files. | |
| Cinnamomum verum | Root Bark | -- | -- | * | |
| Saussurea lappa | Root Essent. Oil | -- | -- | * | |
| Psidium guajava | Leaf | -- | -- | Morton, J.F., Major Medicinal Plants. 1977. Atlas of Medicinal Plants of Middle America. Bahamas to Yucatan. 1981. | |
| Alpinia galanga | Rhizome | -- | -- | * | |
| Pycnanthemum loomisii | Shoot | -- | -- | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. |