| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Magnolia denudata | Bark | -- | -- | * | |
| Magnolia denudata | Bulb | -- | -- | * | |
| Magnolia denudata | Flower | -- | -- | * | |
| Magnolia denudata | Leaf | -- | -- | * | |
| Magnolia denudata | Twig | -- | -- | * | |
| Leonotis leonurus | Se | -- | 42.0 | Pedro, L.G., Barroso, J.G., Marques, N.T., Ascensao, L., Pais, M.S.S. and Scheffer, J.J.C. 1991. Composition of the Essential Oil from Sepals of Leonotis leonurus R. Br. J. Ess. Oil Res. 3: 451-3 | |
| 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. | |
| Stevia rebaudiana | Flower | -- | 265.0 | Kinghorn, A. D. (Ed.) 2002. Medicinal and Aromatic Plants - Industrial Profiles. Stevia. The genus Stevia. Taylor & Francis. New York, NY. 211 pp. | |
| 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. |