| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Camellia sinensis | Leaf | -- | 1820.0 | 2.4 | * |
| Houttuynia cordata | Shoot | -- | 700.0 | 1.4 | * |
| Hypericum perforatum | Plant | -- | 3000.0 | 1.0 | * |
| Acinos suaveolens | Shoot | -- | 430.0 | 0.4 | Jim Duke's personal files. |
| Erythroxylum novogranatense | Leaf | -- | 100.0 | -0.3 | * |
| Erythroxylum coca | Leaf | -- | 100.0 | -0.3 | * |
| Nicotiana tabacum | Leaf | -- | 25.0 | -0.4 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Glycyrrhiza uralensis | Leaf | -- | 21.0 | -0.4 | * |
| Rosa canina | Leaf | -- | 20.0 | -0.4 | * |
| Bidens pilosa | Leaf | -- | 12.0 | -0.5 | Jim Duke's personal files. |
| Phyllanthus amarus | Shoot | -- | 122.0 | -0.7 | * |
| Urtica dioica | Plant | -- | 200.0 | -1.0 | * |
| Aspalathus linearis | Shoot | -- | 1.0 | -1.1 | * |
| Tropaeolum majus | Leaf | -- | -- | * | |
| Lycopodium selago | Plant | -- | -- | * | |
| Arnica montana | Flower | -- | -- | * | |
| Acacia nilotica | Plant | -- | -- | * | |
| Ammi visnaga | Flower | -- | -- | * | |
| Ammi visnaga | Leaf | -- | -- | * | |
| Papaver somniferum | Flower | -- | -- | * |