| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Origanum majorana | Essential Oil | 48000.0 | 213000.0 | 2.1 | * |
| Melaleuca alternifolia | Essential Oil | 32000.0 | 211500.0 | 2.1 | * |
| Melaleuca alternifolia | Leaf Essent. Oil | -- | 204000.0 | 1.9 | * |
| Citrus reticulata | Leaf Essent. Oil | -- | 201500.0 | 1.9 | * |
| Origanum majorana | Leaf Essent. Oil | -- | 180000.0 | 1.6 | * |
| Origanum vulgare | Essential Oil | -- | 147600.0 | 1.2 | * |
| Melaleuca alternifolia | Root Essent. Oil | -- | 135400.0 | 1.0 | * |
| Cuminum cyminum | Seed Essent. Oil | -- | 135100.0 | 1.8 | * |
| Eucalyptus globulus | Leaf Essent. Oil | 1000.0 | 89000.0 | 0.4 | * |
| Citrus limon | Pericarp Essent. Oil | 12000.0 | 83200.0 | Jim Duke's personal files. | |
| Satureja montana | Essential Oil | 61600.0 | 74200.0 | 0.2 | * |
| Myristica fragrans | Seed Essent. Oil | 19000.0 | 68000.0 | 0.3 | * |
| Artemisia dracunculus | Essential Oil | -- | 56900.0 | -0.0 | * |
| Thymus vulgaris | Essential Oil | 17800.0 | 49500.0 | -0.1 | * |
| Myristica fragrans | Essential Oil | 21000.0 | 47000.0 | -0.2 | * |
| Origanum vulgare | Shoot Essent. Oil | 20700.0 | 46100.0 | 1.0 | * |
| Citrus limon | Leaf Essent. Oil | 3000.0 | 44000.0 | -0.1 | Jim Duke's personal files. |
| Coriandrum sativum | Seed Essent. Oil | -- | 40800.0 | -0.3 | * |
| Petroselinum crispum | Fruit Essent. Oil | 16000.0 | 36300.0 | 1.4 | * |
| Elettaria cardamomum | Root Essent. Oil | -- | 33000.0 | -1.0 | * |