| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Sarcostemma acidum | Plant | -- | -- | * | |
| Acacia nilotica | Seed | -- | 66100.0 | -0.2 | * |
| Artemisia cina | Flower | -- | -- | * | |
| Catha edulis | Leaf | -- | -- | * | |
| Tsuga canadensis | Leaf | -- | 15000.0 | -1.2 | * |
| Acacia nilotica | Wood | -- | 63500.0 | 0.4 | * |
| Caesalpinia pulcherrima | Leaf | -- | 7000.0 | -1.3 | * |
| Plantago ovata | Plant | -- | -- | * | |
| Tsuga canadensis | Root Bark | -- | 245000.0 | 0.5 | * |
| Caesalpinia pulcherrima | Wood | -- | 3000.0 | -1.0 | * |
| Sclerocarya caffra | Leaf | -- | 200000.0 | 1.1 | * |
| Portulaca oleracea | Plant | -- | -- | * | |
| Genista tinctoria | Plant | -- | -- | * | |
| Paeonia lactiflora | Root | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Senecio aureus | Plant | -- | -- | * | |
| Tamarindus indica | Bark | -- | 70000.0 | -0.6 | * |
| Origanum majorana | Plant | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Cinnamomum aromaticum | Plant | -- | -- | * | |
| Annona muricata | Plant | -- | -- | * | |
| Catalpa bignonioides | Bark | -- | 60000.0 | -0.7 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |