| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Calendula officinalis | Plant | -- | -- | * | |
| Carica papaya | Fruit | -- | -- | * | |
| Chrysanthemum coronarium | Plant | -- | -- | * | |
| Citrus sinensis | Fruit | -- | -- | Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. | |
| Medicago sativa | Leaf | -- | -- | * | |
| Momordica charantia | Pericarp | -- | -- | Jim Duke's personal files. | |
| Tecoma stans | Plant | -- | -- | * |