| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Urtica dioica | Inflorescence | -- | -- | Jim Duke's personal files. | |
| Urtica dioica | Plant | -- | 400.0 | * | |
| Illicium verum | Fruit | -- | -- | * | |
| Glycine max | Leaf | -- | -- | * | |
| Ginkgo biloba | Leaf | 40.0 | 130.0 | Jim Duke's personal files. | |
| Euphorbia pulcherrima | Leaf | -- | -- | * | |
| Erythroxylum novogranatense | Leaf | -- | -- | * | |
| Erythroxylum novogranatense | Leaf | -- | -- | * | |
| Echinacea spp | Leaf | -- | -- | Economic & Medicinal Plant Research, 5: 253. | |
| Bryonia alba | Pollen Or Spore | -- | -- | * | |
| Agrimonia eupatoria | Shoot | -- | 25.5 | * |