| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Pyrus communis | Fruit | 43.0 | 19700.0 | 3.3 | * |
| Solidago gigantea | Plant | -- | 21980.0 | 2.4 | * |
| Teucrium scorodonia | Leaf | -- | 20000.0 | 2.1 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Carum carvi | Seed | -- | 2840.0 | 1.9 | * |
| Ocimum basilicum | Leaf | -- | 19100.0 | 1.9 | * |
| Euphrasia officinalis | Shoot | -- | 6000.0 | 1.7 | Jim Duke's personal files. |
| Thymus vulgaris | Leaf | -- | 16900.0 | 1.6 | * |
| Valeriana officinalis | Root | -- | 5800.0 | 1.6 | * |
| Origanum majorana | Leaf | -- | 14100.0 | 1.2 | * |
| Pimpinella anisum | Seed | -- | 2060.0 | 1.2 | * |
| Ipomoea purga | Tuber | 30000.0 | 40000.0 | 1.0 | * |
| Helianthus annuus | Seed | 1600.0 | 1800.0 | 1.0 | * |
| Euphrasia officinalis | Plant | -- | 11500.0 | 0.7 | Tyler, V.E.. 1982. The Honest Herbal. George F. Stickley Co., Philadelphia PA. 263 pp. |
| Verbena officinalis | Leaf | -- | 10000.0 | 0.7 | * |
| Artemisia dracunculus | Leaf | -- | 7640.0 | 0.3 | * |
| Equisetum arvense | Plant | -- | 8000.0 | 0.2 | * |
| Arctium lappa | Root | -- | 2500.0 | 0.2 | * |
| Malus domestica | Fruit | 85.0 | 1270.0 | -0.1 | * |
| Thymus serpyllum | Plant | -- | 6200.0 | -0.1 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Origanum vulgare | Plant | -- | 6000.0 | -0.1 | * |