| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Plantago major | Leaf | -- | -- | * | |
| Scutellaria churchilliana | Plant | -- | -- | * | |
| Scutellaria lateriflora | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Scutellaria baicalensis | Root | -- | -- | * | |
| Scutellaria baicalensis | Plant | -- | -- | * | |
| Teucrium chamaedrys | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |