| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Eucalyptus globulus | Leaf Essent. Oil | 31000.0 | 52000.0 | -0.4 | * |
| Rosmarinus officinalis | Essential Oil | -- | 46000.0 | -0.5 | * |
| Myristica fragrans | Essential Oil | 36000.0 | 44000.0 | -0.5 | * |
| Melaleuca alternifolia | Essential Oil | 9000.0 | 43000.0 | -0.5 | * |
| Carum carvi | Seed | 3000.0 | 42000.0 | 2.2 | * |
| Aesculus hippocastanum | Flower Essent. Oil | -- | 42000.0 | -1.4 | Jim Duke's personal files. |
| Origanum majorana | Essential Oil | -- | 38000.0 | -0.5 | * |
| Salvia officinalis | Leaf Essent. Oil | 10000.0 | 36400.0 | -0.5 | * |
| Origanum vulgare | Shoot Essent. Oil | 1400.0 | 35900.0 | -0.6 | * |
| Juniperus communis | Essential Oil | -- | 31000.0 | -0.6 | * |
| Carum carvi | Fruit | 7860.0 | 30180.0 | 3.6 | * |
| Valeriana officinalis | Leaf Essent. Oil | 2300.0 | 25500.0 | -0.6 | * |
| Eucalyptus grandis | Leaf Essent. Oil | -- | 25000.0 | -0.6 | * |
| Elettaria cardamomum | Fruit Essent. Oil | -- | 25000.0 | -1.2 | * |
| Apium graveolens | Seed | 530.0 | 24000.0 | 1.0 | * |
| Origanum majorana | Leaf Essent. Oil | -- | 24000.0 | -0.6 | * |
| Rosmarinus officinalis | Leaf Essent. Oil | -- | 23000.0 | -0.6 | * |
| Zingiber officinale | Rhizome Essent. Oil | -- | 21000.0 | 1.4 | * |
| Coriandrum sativum | Seed Essent. Oil | 15500.0 | 18950.0 | -0.8 | * |
| Melaleuca alternifolia | Root Essent. Oil | -- | 18700.0 | -0.9 | * |