| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cinnamomum camphora | Leaf | 48.0 | 120.0 | -0.3 | * |
| Cinnamomum verum | Leaf Essent. Oil | -- | -- | * | |
| Cinnamomum verum | Root Bark | -- | -- | * | |
| Cinnamomum verum | Bark | 46.0 | 184.0 | -1.0 | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. |
| Cinnamomum verum | Stem Bark | -- | -- | * | |
| Cistus ladaniferus | Leaf | 17.0 | 1190.0 | 0.8 | * |
| Citrullus colocynthis | Petiole | -- | -- | * | |
| Citrus paradisi | Leaf | -- | 205.0 | -0.2 | * |
| Citrus sinensis | Fruit Juice | 1.0 | 278.0 | * | |
| Citrus limon | Leaf Essent. Oil | 284000.0 | 754000.0 | 2.7 | * |
| Citrus aurantiifolia | Fruit | 4700.0 | 7500.0 | 0.3 | * |
| Citrus reticulata | Essential Oil | -- | -- | * | |
| Citrus limon | Fruit Essent. Oil | 512000.0 | 980000.0 | 1.3 | Jim Duke's personal files. |
| Citrus reticulata | Fruit | 6500.0 | 9400.0 | 0.6 | * |
| Citrus aurantium | Plant | 1000.0 | 8000.0 | 4.4 | Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. |
| Citrus limon | Pericarp Essent. Oil | 512000.0 | 774000.0 | * | |
| Citrus limon | Petiole | -- | 3090.0 | * | |
| Citrus sinensis | Fruit | 8300.0 | 9700.0 | 0.6 | * |
| Citrus limon | Essential Oil | 2796.0 | 8000.0 | -0.7 | * |
| Citrus aurantium | Leaf | 70.0 | 110.0 | -0.3 | * |