| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Rheum rhabarbarum | Root Essent. Oil | -- | -- | * | |
| Rheum officinale | Root | -- | -- | * | |
| Rheum officinale | Bulb | -- | -- | * | |
| Rheum officinale | Rhizome | -- | -- | * | |
| Rumex acetosa | Root | -- | -- | * | |
| Aloe vera | Plant | -- | -- | * | |
| Rumex crispus | Rhizome | -- | -- | * | |
| Rumex crispus | Shoot | -- | 56.0 | * | |
| Rumex crispus | Seed | -- | 280.0 | -1.0 | * |
| Rheum palmatum | Petiole | -- | -- | * | |
| Rheum palmatum | Root | -- | 2100.0 | -1.0 | * |
| Rheum palmatum | Tissue Culture | -- | -- | * | |
| Rheum palmatum | Rhizome | -- | -- | * | |
| Rheum palmatum | Bulb | -- | -- | * | |
| Rumex acetosella | Root | -- | -- | * | |
| Andira araroba | Wood | -- | -- | * | |
| Gloriosa superba | Bulb | -- | -- | * | |
| Ganoderma lucidum | Fruit | -- | -- | * | |
| Frangula purshiana | Plant | -- | -- | * | |
| Aloe vera | Leaf | -- | -- | Mary, N. Y., Christensen, B. V., Beal, J. L. 1956. A Paper Chromatographic Study of Aloe, Aloin and Cascara sagrada. J. Amer. Pharm. Ass. Sci. Ed., 45: 229-232. |