| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Citrus spp | Leaf | -- | -- | Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. | |
| Petroselinum crispum | Fruit Essent. Oil | -- | 56000.0 | * | |
| Angelica archangelica | Root Essent. Oil | -- | 530000.0 | * | |
| Angelica archangelica | Fruit | -- | -- | * | |
| Citrus limon | Root | -- | -- | Jim Duke's personal files. | |
| Citrus paradisi | Root | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Citrus reticulata | Root | -- | -- | * | |
| Angelica archangelica | Root | -- | 2000.0 | * | |
| Citrus sinensis | Root | -- | -- | Jim Duke's personal files. | |
| Apium graveolens | Leaf | -- | -- | * |