| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Opuntia ficus-indica | Pt | -- | -- | * | |
| Artemisia annua | Plant | -- | -- | * | |
| Dodonaea viscosa | Shoot | -- | -- | * | |
| Opuntia ficus-indica | Flower | -- | -- | Rizk, A.F.M. and Al-Nowaihi, A.S., The Phytochemistry of the Horticultural Plants of Qatar, Scientific and Applied Research Centre, University of Qatar. | |
| Vitex agnus-castus | Fruit | -- | -- | * | |
| Vitex agnus-castus | Plant | -- | -- | * | |
| Ononis spinosa | Root | -- | -- | Blaschek, W., Hansel, R., Keller, K., Reichling, J., Rimpler, H., and Schneider, G. eds. 1998. Hager's Handbuch der Pharmazeutischen Praxis, Auflage Band 2 (A-K), 909 pp., (L-Z), 858 pp. Springer-Verlag, Berlin. |