| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Angelica archangelica | Root | -- | 5.0 | 1.0 | * |
| Glycyrrhiza glabra | Root | 0.1 | 2.0 | -1.0 | * |
| Rheum palmatum | Rhizome | -- | 0.5 | * | |
| Pimenta racemosa | Leaf | -- | -- | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. | |
| Tilia sp. | Flower | -- | -- | * | |
| Anethum graveolens | Root | -- | -- | Rizk, A.F.M., The Phytochemistry of the Flora of Qatar, Scientific and Applied Research Centre, University of Qatar, Kingprint, Richmond, UK, 1986. | |
| Capsicum frutescens | Fruit | -- | -- | * | |
| Capsicum annuum | Fruit | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Pimenta dioica | Plant | -- | -- | * | |
| Brassica oleracea | Stem | -- | -- | * | |
| Ephedra sinica | Shoot | -- | -- | * |