| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Illicium verum | Fruit | -- | 1.0 | * | |
| Lavandula x intermedia | Plant | -- | -- | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. | |
| Lavandula angustifolia | Flower | -- | -- | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. | |
| Ocimum basilicum | Essential Oil | -- | -- | * | |
| Ocimum gratissimum | Plant | -- | -- | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. | |
| Opopanax chironium | Essential Oil | -- | -- | * | |
| Panax ginseng | Shoot Essent. Oil | -- | -- | * | |
| Panax ginseng | Flower Essent. Oil | -- | -- | * | |
| Panax ginseng | Root Essent. Oil | -- | -- | * | |
| Pelargonium graveolens | Plant | -- | -- | * | |
| Petasites japonicus | Rhizome | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Pimenta dioica | Plant | -- | -- | * | |
| Piper nigrum | Fruit | -- | -- | * | |
| Piper nigrum | Fruit Essent. Oil | -- | -- | * | |
| Rheum palmatum | Rhizome | -- | 1.5 | * | |
| Santalum album | Wood | -- | -- | * | |
| Umbellularia californica | Plant | 10.0 | 40.0 | * |