| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Melaleuca alternifolia | Essential Oil | -- | -- | * | |
| Panax ginseng | Flower Essent. Oil | -- | -- | * | |
| Panax ginseng | Root | -- | -- | * | |
| Panax ginseng | Shoot | -- | -- | * | |
| Nardostachys chinensis | Rhizome | -- | -- | * | |
| Artemisia pallens | Plant | 3.0 | 12.0 | -1.0 | * |
| Aloysia citrodora | Plant | 20.0 | 140.0 | 1.0 | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. |
| Panax quinquefolius | Root Essent. Oil | 4938.0 | 6134.0 | * |