| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Laurus nobilis | Essential Oil | -- | -- | * | |
| Vanilla planifolia | Fruit | -- | -- | Leung, A.Y., Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley & Sons, New York, 1980. | |
| Melia azedarach | Wood | -- | -- | * | |
| Nicotiana tabacum | Leaf | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Agathosma betulina | Leaf Essent. Oil | -- | -- | * | |
| Ocimum tenuiflorum | Inflorescence | -- | -- | * | |
| Hyssopus officinalis | Essential Oil | -- | -- | * | |
| Syzygium aromaticum | Fruit | -- | -- | * | |
| Polianthes tuberosa | Flower | -- | -- | * | |
| Lantana camara | Leaf | -- | -- | * | |
| Mentha longifolia | Shoot | -- | -- | * | |
| Piper auritum | Leaf | -- | -- | Tramil | |
| Zea mays | Seed | -- | -- | * | |
| Ligustrum japonicum | Flower | -- | -- | * | |
| Panax ginseng | Root Essent. Oil | -- | -- | * | |
| Capsicum annuum | Fruit | -- | -- | * | |
| Psidium guajava | Essential Oil | -- | -- | * | |
| Mentha arvensis var. piperascens | Essential Oil | -- | -- | Jim Duke's personal files. | |
| Cuminum cyminum | Fruit | -- | -- | * | |
| Camellia sinensis | Fruit | -- | -- | * |