| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Asimina triloba | Fruit | -- | 0.001 | -0.8 | * |
| Rheum palmatum | Rhizome | -- | 0.5 | * | |
| Citrus aurantiifolia | Fruit | -- | 2.0 | -0.6 | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. |
| Citrus reticulata | Fruit | -- | 4.0 | -0.4 | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. |
| Ephedra sinica | Shoot | -- | 6.0 | 1.7 | * |
| Glycyrrhiza glabra | Root | -- | 7.0 | Kameoka, H. and Nakai, K. 1987. Components of essential oil from the root of Glycyrrhiza-glabra. Nippon Gogeikagaku Kaishi 61(9): 1119-1122. | |
| Morinda citrifolia | Fruit | -- | 25.0 | 1.7 | * |
| Tamarindus indica | Fruit Essent. Oil | -- | 2200.0 | * | |
| Cocos nucifera | Seed | 4670.0 | 57520.0 | * | |
| Glycyrrhiza glabra | Rhizome Essent. Oil | -- | 114000.0 | * |