| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Medicago sativa | Fruit | -- | 120.0 | 1.4 | * |
| Viburnum prunifolium | Root Bark | 4.0 | 90.0 | 1.0 | * |
| Urtica dioica | Root | 3.0 | 36.0 | 1.0 | * |
| Lycium chinense | Fruit | 9.0 | 19.0 | -0.5 | Hansel, R., Keller, K., Rimpler, H., and Schneider, G. eds. 1992. Hager's Handbuch der Pharmazeutischen Praxis, Drogen (A-D), 1209 pp., 1993 (E-O), 970 pp., 1994 (P-Z), 1196 pp. Springer-Verlag, Berlin. |
| Morinda citrifolia | Fruit | -- | 0.85 | -0.9 | * |
| Avena sativa | Root | -- | 10.0 | -1.0 | * |
| Viburnum opulus | Root Bark | -- | 7.5 | -1.0 | * |
| Chamaemelum nobile | Plant | -- | -- | * | |
| Citrus limon | Shoot | -- | -- | Jim Duke's personal files. | |
| Allium ampeloprasum | Plant | -- | -- | * | |
| Foeniculum vulgare | Seed | -- | -- | Rizk, A.F.M., The Phytochemistry of the Flora of Qatar, Scientific and Applied Research Centre, University of Qatar, Kingprint, Richmond, UK, 1986. | |
| Sonchus oleraceus | Plant | -- | -- | * | |
| Glehnia littoralis | Rhizome | -- | -- | * | |
| Solanum melongena | Fruit | -- | -- | * | |
| Glehnia littoralis | Root | -- | -- | * | |
| Apium graveolens | Leaf | -- | -- | * | |
| Medicago sativa | Plant | -- | -- | * | |
| Cynara cardunculus | Leaf | -- | -- | Jim Duke's personal files. | |
| Artemisia capillaris | Bud | -- | -- | * | |
| Inula helenium | Plant | -- | -- | J.S. Glasby Dict.Pls Containing 2ndary Metabolite. 1991. |