| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Berberis vulgaris | Fruit | -- | -- | Jim Duke's personal files. | |
| Artemisia abrotanum | Plant | -- | -- | * | |
| Stachys officinalis | Plant | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Apium graveolens | Seed | -- | -- | Wealth of India. | |
| Scopolia carniolica | Leaf | -- | -- | * | |
| Teucrium scordium | Plant | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Brassica oleracea var. capitata l. | Plant | -- | -- | * | |
| Crataegus laevigata | Plant | -- | -- | * | |
| Physalis peruviana | Leaf | -- | -- | * | |
| Arachis hypogaea | Seed | -- | 12.0 | -0.6 | * |
| Pluchea carolinensis | Shoot | -- | -- | Tramil | |
| Thymus vulgaris | Shoot | -- | -- | * | |
| Fragaria spp | Fruit | -- | -- | Jim Duke's personal files. | |
| Stachytarpheta jamaicensis | Plant | -- | -- | * | |
| Rubus phoenicolasius | Leaf | -- | -- | Okuda, T., Yoshida, T., Hatano, T., Iwasaki, M., Kubo, M., Orime, T., Yoshizaki, M., Naruhashi, N. 1992. Hydrolysable Tannins as Chemotaxonomic Markers in the Rosaceae. Phytochemistry, 31(9): 3091-3096. | |
| Equisetum arvense | Shoot | -- | -- | Jim Duke's personal files. | |
| Arctium lappa | Root | -- | -- | * | |
| Althaea officinalis | Root | -- | -- | * | |
| Brassica oleracea var. capitata l. | Leaf | -- | -- | * | |
| Vitis vinifera | Leaf | -- | -- | * |